FWIW: In the spirit of offering alternate Designs for TV antennas, here is another option to go along with my previous posting on LPDA antenna design.

For those that are interested, I came across a patent for a combination Dual Rhombic and V-type antenna that provides any DIY'er with a VHF and UHF combo antenna, that claims a design objective of 12-15 dBi for VHF, including Ch2-6; and 26dBi for UHF.

Normally Rhombic antennas are large, but for those that have a suitable outdoor location, this type of antenna presents some interesting options.


Patent Abstract:
============

A combination of two justaposed rhombic antennas and a V-antenna on a single, longitudinal, non-condictive support boom. The two rhombic antennas lie flat upon one another in substantially the same plane and are supported on the boom with insulating transverse spreader rods.

What is claimed ?
=============
In the Summary of Invention, the patent makes the following claims:

- provides low wind resistance
- a good front to back ratio having substantially a zero angle of radiation
- improved signal in the Channel 2 to 6 range....
- UHF gain objective of 26db
- VHF gain objective of 12-15 dB with F/B of 30-40dB

US patent 4,667,204 is dated May 19, 1987 with the following title:
Combination Dual Rhombic and V-Type Antenna for VHF-UHF Televison Receivers.


You can view the patent at the following link, simply enter patent number:
http://www.pat2pdf.org



If you have any interest in "Log-Periodic Dipole Array" (LPDA) antennas, have a look at my earlier posting about possible modeling of the Wade LPDA Model WL 7-13/S antenna...here....
http://www.digitalhome.ca/forum/showpost.php?p=839351&postcount=6

Heh, I thought that patent looked familiar, I downloaded it in March. Comparing it to the gain of other rhombic designs, I would be skeptical about the gain claims of that patent.

I did see mention somewhere of a six stack rhombic that had a gain of 26 db (or even higher ?). Rhombics are huge antennas, each leg needs to be like a minimum of 5 wavelengths. But maybe useful for your wi-fi antenna ?

Heh, I thought that patent looked familiar, I downloaded it in March.

I posted it in the spirit of sharing other DIY options, and that it might serve the title of this thread..."Research and Development". This patent also references about 18 other patents, that readers might want to take a look at. As you say, this is a quite large structure, and perhaps may be "over-the-top"
If it's deemed not appropriate, I'm sure Stampeder will deep six it.


I would be skeptical about the gain claims of that patent.
Nothing wrong with being skeptical. I've seen posts that stated similar skepticism on some of the GH 18dBi designs. That view is valid, until there is some "real-world evidence that supports the claim.
Anyone willing to experiment ?

...maybe useful for your wi-fi antenna ?

Not really, as I had mentioned before, my Wi-Fi, is one of my private GH projects, which is investigating the effect of half-angles >45 and results to date are quite interesting.
My other private project is a practically-sized GH-FM antenna which is currently under trial, and for our local Ottawa requirements, I've added a third project that will investigate variations on j3d's excellent X-GH8 design, which will try to achieve hi gain over the Ch23 to Ch38 bandwidth, as it now appears, based on latest reception/astc tuner reports by mlord, that only 18dBi may be required and this appears achievable in a single x-GH antenna with max height of around 65".

My other private project is a practically-sized GH-FM antenna which is currently under trial
Im curious, what gain do you have on it at 85 mhz ?

based on latest reception/astc tuner reports by mlord,
Yeah, it sounds like a newer generation ATSC tuner might be the answer to your problems with that one channel.

Im curious, what gain do you have on it at 85 mhz ?


The design is for FM 88 to 108Mhz. To keep the GH-FM to a practical size, the current design operates at f/2 and there is a very rapid fall-off below 88Mhz, so I'm afraid, as designed, it is worse than rabbit ears for Ch 6, and probably has negative NetGain at 85MHz.

If you are after a simple design for Ch 6, you could try a Lazy-H.
If memory serves me, I think what I modeled had about 4dBi, maybe as high as 6(?) without any reflectors.

You could also look at a VHF-Lo LPDA design, 7-8dBi is possible with a relatively small number of elements. Have a read of the LPDA design pdf link that I recently posted.

it now appears, based on latest reception/astc tuner reports by mlord, that only 18dBi may be required
So far, this continues to hold up.

I've got MythTV all nicely upgraded to the current stable release (0.21), with (almost) the latest Linux hardware drivers and associated software. It's sitting here today recording our usual Saturday PBS programming in digital, as well as on the old analog tuners for the time being.

Looks like the sun is out now, so I'll have it record various bits through the afternoon as well -- usually the toughest conditions for reception. It'll take a few weeks before I give it 100% confidence and stop recording the analog versions alongside, but all indications are very good right now.

So the existing gain setup (dual PR-8800, 0.4dB LNA, 1:4 splitter) seems to be sufficient with the XC5000 tuner front-end (in the 950Q).

And the 950Q, being a tiny little USB stick, is easy to move around.. say for brief trials at other antenna test sites if/when the need arises. :)

Cheers

Some examples of V-Boom antennas of the past are in this thread:

http://www.digitalhome.ca/forum/showthread.php?t=97513

Now theres a big antenna .Rhombic you would need 4 telephone poles
But anyways I was over at holl_ands site looking around at some antennas and came across a Cubical Quad and copied a copy of the NEC and had a close look at and I seen what looked like a Rhombic without a termenal resistor

I have not figured out how to make one up yet in 4NEC2 But someone else here i believe does.

Anyways after discovering this , I sent a message off to holl_ands telling him of my discover or what i had seen and wanted him to know. I also sent him off a NEC file that i was playing with and well I would like to post the NEC file with holl_ands and my work.

holl_ands I posted the NEC file as you sent it back to me IM still play with what you said.

holl_ands how do I go about making a termenal resistor ? I'm a little lost there. Oh and hollands I have a 2477 mhz one designed also :cool:
CM VHF+UHF Small Rhombic, Stacked, 4nec2 by WildWillie, 2Feb2011
CM holl_ands mod: ROUNDOFF Decimals and MATCHING DIMENSIONS all around.
CM holl_ands mod: Added Termination Resistors (typical for Rhombic Antenna).
CM Termination resistors greatly improve UHF Gain & SWR, an without them,
CM the Hi-VHF Gain FORWARD is improved (although max Gain is mostly to REAR).
CM UHF Gain = 11.6-13.9 dBi, SWR < 2.0, AGT = 1.0. Autoseg(7).
CM Hi-VHF Gain = 3.2-2.5 dbi towards REVERSE, SWR < 2.0, AGT = 1.0.
CE
SY Rsrc= 0.028 ' Adjust Simulated SOURCE Radius for AGT=1.0: UHF=0.06 & Hi-VHF=0.028
SY Rterm=300 ' Termination Resistor (ohms)
GW 1 1 -11.75 -0.5 0 -11.75 0.5 0 Rsrc
GW 2 7 -11.75 -0.25 -9.25 -11.75 -0.5 0 0.0320492
GW 3 7 -11.75 -0.5 0 -11.75 -0.25 9.25 0.0320492
GW 4 7 -11.75 0.25 -9.25 -11.75 0.5 0 0.0320492
GW 5 7 -11.75 0.5 0 -11.75 0.25 9.25 0.0320492
GW 6 15 0 16.5 -9.25 11.75 0 -9.25 0.0320492
GW 7 15 0 -16.5 -9.25 11.75 0 -9.25 0.0320492
GW 8 15 0 -16.5 -9.25 -11.75 -0.25 -9.25 0.0320492
GW 9 15 -11.75 0.25 -9.25 0 16.5 -9.25 0.0320492
GW 10 15 0 16.5 9.25 11.75 0 9.25 0.0320492
GW 11 15 0 -16.5 9.25 11.75 0 9.25 0.0320492
GW 12 15 0 -16.5 9.25 -11.75 -0.25 9.25 0.0320492
GW 13 15 -11.75 0.25 9.25 0 16.5 9.25 0.0320492
GS 0 0 0.0254 ' Convert above from INCHES to METERS for NEC
GE 0 ' No Ground Plane
EK 0 ' Enable Extended Kernel
LD 5 0 0 0 5.8e7 0
EX 0 1 1 0 1 0
' LD 0 6 15 0 Rterm/2 0 0 ' (Half of) Termination Resistor
' LD 0 7 15 0 Rterm/2 0 0 ' (Half of) Termination Resistor
' LD 0 10 15 0 Rterm/2 0 0 ' (Half of) Termination Resistor
' LD 0 11 15 0 Rterm/2 0 0 ' (Half of) Termination Resistor
GN -1 ' Free Space
' FR 0 1 0 0 174 0 ' fm WildWillie
' RP 0 1 73 1510 90 0 1 5 0 0 ' fm WildWillie
' FR Freq Sweep choices in order of increasing calculation time (fm holl_ands):
' FR 0 0 0 0 198 0 ' Fixed Freq
' FR 0 0 0 0 584 0 ' Fixed Freq
FR 0 29 0 0 470 12 ' Freq Sweep 470-806 every 12 MHz - OLD UHF BAND
' FR 0 34 0 0 410 12 ' Freq Sweep 410-806 every 12 MHz - Even Wider Sweep
' FR 0 39 0 0 470 6 ' Freq Sweep 470-698 every 6 MHz - PREFERRED FOR UHF
' FR 0 77 0 0 470 3 ' Freq Sweep 470-698 every 3 MHz
' FR 0 153 0 0 470 1.5 ' Freq Sweep 470-698 every 1.5 MHz
' FR 0 71 0 0 300 10 ' Freq Sweep 300-1000 every 10 MHz - WIDEBAND SWEEP
' FR Hi-VHF choices:
' FR 0 15 0 0 174 3 ' Freq Sweep 174-216 every 3 MHz
' FR 0 29 0 0 174 1.5 ' Freq Sweep 174-216 every 1.5 MHz - PREFERRED
' FR 0 43 0 0 174 1 ' Freq Sweep 174-216 every 1 MHz - Hi-Rez
' FR 0 26 0 0 150 6 ' Freq Sweep 150-300 every 6 MHz - WIDEBAND SWEEP
' FR Lo-VHF choices:
' FR 0 19 0 0 54 3 ' Frequency Sweep every 3 MHz for Ch2-6 + FM
' FR 0 35 0 0 54 1 ' Frequency Sweep every 1 MHz for Ch2-6
' FR 0 36 0 0 75 1 ' Frequency Sweep every 1 MHz for Ch5 + Ch6 + FM
' FR 0 28 0 0 54 6 ' Wide Freq Sweep every 6 MHz for Ch2-13
' FR 0 64 0 0 54 12 ' Super Wide Freq Sweep 54-810 (Ch2-69) every 12 MHz
' RP choices in order of increasing calculation time:
' RP 0 1 1 1510 90 90 1 1 0 0 ' 1D Gain toward 0-deg Azimuth - SIDE GAIN
' RP 0 1 1 1510 90 0 1 1 0 0 ' 1D Gain toward 90-deg Azimuth - FORWARD GAIN
' RP 0 1 1 1510 90 180 1 1 0 0 ' 1D Gain toward 270-deg Azimuth - REVERSE GAIN
' RP 0 1 37 1510 90 0 1 5 0 0 ' 2D (Left only) Azimuthal Gain Slice
RP 0 1 73 1510 90 0 1 5 0 0 ' 2D Azimuthal Gain Slice - PREFERRED
' RP 0 73 1 1510 90 0 5 1 0 0 ' 2D Elevation Gain Slice
' RP 0 73 73 1510 90 0 5 5 0 0 ' 3D Lower Hemisphere reveals antenna (Fixed Freq)
' RP 0 285 73 1510 90 0 5 5 0 0 ' 3D Full Coverage obscures antenna (Fixed Freq)
EN

VHF+UHF Small Rhombic Stack:

Termination Resistors (300-ohm each) are connected between the two wires going
into the apex as shown in the diagram, just like a Balun connection at the Feedpoint.
The wires going into the apex are NOT connected directly together...that is an artifact of 4nec2.
I used LD Cards to simulate PAIRS of 150-ohm resistors, each in series with the last wire segment,
so that they would be symmetric (vice 300-ohm on only one wire).

Full results can be found here:
http://imageevent.com/holl_ands/dipoles/uhfsmallrhombicstack
As can be seen from the charts, performance mid-band is quite good, but falls off for
both Gain and F/B Ratio on low and high freqs. I was surprised by the low SWR for Hi-VHF,
even though Max Gain poked out the REAR (a common occurrence for "UHF" antennas).

http://photos.imageevent.com/holl_ands/dipoles/uhfsmallrhombicstack//VHFandUHF_Small%20Rhombic_Stacked_WildWillieandholl_ands%20-%203D%20View.jpg

In the 4nec2 file above, Rsrc was incorrect and the Termination Resistors were commented out.
Here's the revised 4nec2 file with the Termination Resistors enabled:
CM VHF+UHF Small Rhombic, Stacked, 4nec2 by WildWillie, 6Feb2011
CM holl_ands mod: ROUNDOFF Decimals and MATCHING DIMENSIONS all around.
CM holl_ands mod: Added Termination Resistors (typical for Rhombic Antenna).
CM Termination resistors greatly improve UHF Gain & SWR, an without them,
CM the Hi-VHF Gain FORWARD is improved (although max Gain is mostly to REAR).
CM UHF Gain = 11.6-13.9 dBi, SWR < 2.0, AGT = 1.0. Autoseg(7).
CM Hi-VHF Gain = 3.2-2.5 dbi towards REVERSE, SWR < 2.6, AGT = 1.0.
CE
SY Rsrc=0.06 ' Adjust Simulated SOURCE Radius for AGT=1.0: UHF=0.06 & Hi-VHF=0.06
SY Rterm=300 ' Termination Resistor (ohms)
GW 1 1 -11.75 -0.5 0 -11.75 0.5 0 Rsrc
GW 2 7 -11.75 -0.25 -9.25 -11.75 -0.5 0 0.0320492
GW 3 7 -11.75 -0.5 0 -11.75 -0.25 9.25 0.0320492
GW 4 7 -11.75 0.25 -9.25 -11.75 0.5 0 0.0320492
GW 5 7 -11.75 0.5 0 -11.75 0.25 9.25 0.0320492
GW 6 15 0 16.5 -9.25 11.75 0 -9.25 0.0320492
GW 7 15 0 -16.5 -9.25 11.75 0 -9.25 0.0320492
GW 8 15 0 -16.5 -9.25 -11.75 -0.25 -9.25 0.0320492
GW 9 15 -11.75 0.25 -9.25 0 16.5 -9.25 0.0320492
GW 10 15 0 16.5 9.25 11.75 0 9.25 0.0320492
GW 11 15 0 -16.5 9.25 11.75 0 9.25 0.0320492
GW 12 15 0 -16.5 9.25 -11.75 -0.25 9.25 0.0320492
GW 13 15 -11.75 0.25 9.25 0 16.5 9.25 0.0320492
GS 0 0 0.0254 ' Convert above from INCHES to METERS for NEC
GE 0 ' No Ground Plane
EK 0 ' Enable Extended Kernel
LD 5 0 0 0 5.8e7 0
EX 0 1 1 0 1 0
LD 0 6 15 0 Rterm/2 0 0 ' (Half of) Termination Resistor
LD 0 7 15 0 Rterm/2 0 0 ' (Half of) Termination Resistor
LD 0 10 15 0 Rterm/2 0 0 ' (Half of) Termination Resistor
LD 0 11 15 0 Rterm/2 0 0 ' (Half of) Termination Resistor
GN -1 ' Free Space
' FR 0 1 0 0 174 0 ' fm WildWillie
' RP 0 1 73 1510 90 0 1 5 0 0 ' fm WildWillie
' FR Freq Sweep choices in order of increasing calculation time (fm holl_ands):
' FR 0 0 0 0 198 0 ' Fixed Freq
' FR 0 0 0 0 584 0 ' Fixed Freq
FR 0 29 0 0 470 12 ' Freq Sweep 470-806 every 12 MHz - OLD UHF BAND
' FR 0 34 0 0 410 12 ' Freq Sweep 410-806 every 12 MHz - Even Wider Sweep
' FR 0 39 0 0 470 6 ' Freq Sweep 470-698 every 6 MHz - PREFERRED FOR UHF
' FR 0 77 0 0 470 3 ' Freq Sweep 470-698 every 3 MHz
' FR 0 153 0 0 470 1.5 ' Freq Sweep 470-698 every 1.5 MHz
' FR 0 71 0 0 300 10 ' Freq Sweep 300-1000 every 10 MHz - WIDEBAND SWEEP
' FR Hi-VHF choices:
' FR 0 15 0 0 174 3 ' Freq Sweep 174-216 every 3 MHz
' FR 0 29 0 0 174 1.5 ' Freq Sweep 174-216 every 1.5 MHz - PREFERRED
' FR 0 43 0 0 174 1 ' Freq Sweep 174-216 every 1 MHz - Hi-Rez
' FR 0 26 0 0 150 6 ' Freq Sweep 150-300 every 6 MHz - WIDEBAND SWEEP
' FR Lo-VHF choices:
' FR 0 19 0 0 54 3 ' Frequency Sweep every 3 MHz for Ch2-6 + FM
' FR 0 35 0 0 54 1 ' Frequency Sweep every 1 MHz for Ch2-6
' FR 0 36 0 0 75 1 ' Frequency Sweep every 1 MHz for Ch5 + Ch6 + FM
' FR 0 28 0 0 54 6 ' Wide Freq Sweep every 6 MHz for Ch2-13
' FR 0 64 0 0 54 12 ' Super Wide Freq Sweep 54-810 (Ch2-69) every 12 MHz
' RP choices in order of increasing calculation time:
' RP 0 1 1 1510 90 90 1 1 0 0 ' 1D Gain toward 0-deg Azimuth - SIDE GAIN
' RP 0 1 1 1510 90 0 1 1 0 0 ' 1D Gain toward 90-deg Azimuth - FORWARD GAIN
' RP 0 1 1 1510 90 180 1 1 0 0 ' 1D Gain toward 270-deg Azimuth - REVERSE GAIN
' RP 0 1 37 1510 90 0 1 5 0 0 ' 2D (Left only) Azimuthal Gain Slice
RP 0 1 73 1510 90 0 1 5 0 0 ' 2D Azimuthal Gain Slice - PREFERRED
' RP 0 73 1 1510 90 0 5 1 0 0 ' 2D Elevation Gain Slice
' RP 0 73 73 1510 90 0 5 5 0 0 ' 3D Lower Hemisphere reveals antenna (Fixed Freq)
' RP 0 285 73 1510 90 0 5 5 0 0 ' 3D Full Coverage obscures antenna (Fixed Freq)
EN

Small Rhombic Stack: UHF Performance Highlights:
http://photos.imageevent.com/holl_ands/dipoles/uhfsmallrhombicstack//VHFandUHF_Small%20Rhombic_Stacked_WildWillieandholl_ands%20-%20UHF%20Raw%20Gain.jpg

http://photos.imageevent.com/holl_ands/dipoles/uhfsmallrhombicstack//VHFandUHF_Small%20Rhombic_Stacked_WildWillieandholl_ands%20-%20UHF%20SWR_300.jpg

Small Rhombic Stack: Hi-VHF Performance Highlights:

Although there is a Gain lobe forwards of about 1 dBi, the most Gain in Hi-VHF
band is towards the REAR, as shown in the below diagrams (note Azimuth=270-deg).

3D Horizontal Gain at 198 MHz:
http://photos.imageevent.com/holl_ands/dipoles/uhfsmallrhombicstack//VHFandUHF_Small%20Rhombic_Stacked_WildWillieandholl_ands%20-%203D%20Horiz%20Pattern%20at%20198%20MHz.jpg

http://photos.imageevent.com/holl_ands/dipoles/uhfsmallrhombicstack//VHFandUHF_Small%20Rhombic_Stacked_WildWillieandholl_ands%20-%20Hi-VHF%20Raw%20Gain%20to%20REVERSE.jpg

http://photos.imageevent.com/holl_ands/dipoles/uhfsmallrhombicstack//VHFandUHF_Small%20Rhombic_Stacked_WildWillieandholl_ands%20-%20Hi-VHF%20SWR_300.jpg

holl_ands thank you for the answer I'M still playing with some reflectors but it realy does not need it. and a single Rhombic for 2477mhz I think i have the termenial resistor correct spot load of 300 ohms on a single wire the 1 inch one out front this antenna can go up to 18 dbi but she be around 120 inches long.

CM Rhombic vertical wifi 16 dbi swr1.08 2477mhz wildwillie Feb 6 2011
CE
GW 1 5 -42.5 0 0 -42.5 0 -0.5 0.03204186
GW 2 461 -42.5 0 0 -0.5 0 12.5 0.03204186
GW 3 459 -42.5 0 -0.5 -0.5 0 -12.5 0.03204186
GW 4 11 19 0 0.5 19 0 -0.5 0.03204186
GW 5 241 19 0 0.5 -0.5 0 12.5 0.03204186
GW 6 241 19 0 -0.5 -0.5 0 -12.5 0.03204186
GS 0 0 0.0254 ' All in in.
GE 0
EK
LD 5 0 0 0 5.8e7 0
LD 3 4 6 6 33 0
EX 0 1 3 0 1 0
GN -1
FR 0 1 0 0 2477 0

Wi-Fi (2.4 GHz) Vertical Rhombic:

For SWR=1.08 reported in the file above, you obviously assumed 300-ohm characteristic impedance.
HOWEVER, Wi-Fi transmitters are 50-ohm, which would cause a serious mismatch.

If you buy or build a 4:1 Balun Transformer that operates with low loss across the Wi-Fi band,
(TV Band Baluns probably are HIGH loss) then you might be interested in SWR performance
for a 200-ohm load, which I summarized in the revised 4nec2 file below...not very good, unless
you restrict the Wi-Fi channel assignment to the "sweet spot"....
[I included FR and RP statements for running a frequency sweep across the entire Wi-Fi Band.]

You should research Wi-Fi transmitter modules (check part number inside your router???)
to see what sort of antenna VSWR they can tolerate. Even moderate levels of reflected power
can distort the transmitted digital waveform and higher levels might trip output protect circuits
and possibly even destroy the transmitter device....

I tried 33-ohm as well as a 200-ohm Termination Resistor, but essentially no difference.
I also tried "LD 3" (Parallel R-L-C) in addition to "LD 2" (Series R-L-C) statements.....no difference.

Here's the revised 4nec2:
CM Wi-Fi (2.4 GHz) Vertical Rhombic, 4nec2 by wildwillie, 7Feb2011
CM holl_ands: added FR+RP Choices, GW2+3 segments equal, try 200-ohm Resistor (no diff).
CM At 2477 MHz: Gain=16.1 dbi, F/B=8.4 dB, HBW=20-deg, VBW=10-deg. AGT=1.0.
CM 300-ohm SWR=1.08 at 2477, but if using 4:1 Balun to match 50-ohm then
CM 200-ohm SWR<2.0 from 2445-2488 MHz and SWR<2.7 from 2400-2445 and 2485-2500.
CM Termination Resistor = 200-ohms, in SERIES R-L-C on GW4's center segment (6).
CE
GW 1 5 -42.5 0 0 -42.5 0 -0.5 0.03204186
GW 2 461 -42.5 0 0 -0.5 0 12.5 0.03204186
GW 3 461 -42.5 0 -0.5 -0.5 0 -12.5 0.03204186
GW 4 11 19 0 0.5 19 0 -0.5 0.03204186
GW 5 241 19 0 0.5 -0.5 0 12.5 0.03204186
GW 6 241 19 0 -0.5 -0.5 0 -12.5 0.03204186
GS 0 0 0.0254 ' All in inches.
GE 0
EK
LD 5 0 0 0 5.8e7 0
LD 2 4 6 6 200 0 ' 200-ohm Termination Resistor
EX 0 1 3 0 1 0
GN -1
' FR 0 1 0 0 2477 0 ' fm WildWillie
FR 0 11 0 0 2400 10 ' Freq Sweep 2.4-2.5 GHz every 10 MHz
' RP choices in order of increasing calculation time:
' RP 0 1 1 1510 90 90 1 1 0 0 ' 1D Gain toward 0-deg Azimuth - SIDE GAIN
' RP 0 1 1 1510 90 0 1 1 0 0 ' 1D Gain toward 90-deg Azimuth - FORWARD GAIN
' RP 0 1 1 1510 90 180 1 1 0 0 ' 1D Gain toward 270-deg Azimuth - REVERSE GAIN
' RP 0 1 37 1510 90 0 1 5 0 0 ' 2D (Left only) Azimuthal Gain Slice
RP 0 1 73 1510 90 0 1 5 0 0 ' 2D Azimuthal Gain Slice - PREFERRED
' RP 0 73 1 1510 90 0 5 1 0 0 ' 2D Elevation Gain Slice
' RP 0 73 73 1510 90 0 5 5 0 0 ' 3D Lower Hemisphere reveals antenna (Fixed Freq)
' RP 0 285 73 1510 90 0 5 5 0 0 ' 3D Full Coverage obscures antenna (Fixed Freq)
EN