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Old 2010-04-16, 12:30 AM   #1
ota_canuck
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Cool Building The Stealth Hawk TV Antenna (See Post #304)

Awsome. It was just a shot in the dark. This thing works!



This one out performs anything that I've ever tried.

I get all my regular OTA digital and analog channels. No rotor required.

analog: 5,6,9,11,13,19,25,28,31,41,47 [11 channels that's all I ever could get Cdn]

digital: 2.x,4.1,5.1,7.1,9.1,11.1,12.x,15.1,17.1,23.1,24.1,26.x,29.1, 36.1,44.1,49.1,51.x,54.x,66.x [30 digital channels]

The front side is facing Toronto [30deg] 52miles, the back face Erie [210deg] 57 miles, Buffalo [86deg] 40 miles to east the side, Hamilton [340deg] 22miles on the other side.

It must be mounted at the tip of the mast and it can't seem to be used with any reflectors or any deflectors. It can not be stacked or ganged. Don't know why? But it outperforms anything I've ever tried.

http://www.tvfool.com/?option=com_wr...9c6be0724b5f66

I'm getting all the way through the tvfool list down to -10NM

I'm hoping someone else can build one of these to see if it works in other reception areas.

___________________________

This antenna either has an extremely wide beam width, or it has multiple lobes to be able to cover all these broadcast sources with one single aim.

___________________________

What's in a name? "Stealth Hawk Antenna":

Stealth: At 35ft up on the tip of the mast it is barely even noticable.
Hawk: It looks like a faint siloette of a hawk sitting up on top of the mast.
Antenna: It's a fully functional, stable UHF/VHF Bi-directional antenna.

There are so many builds and trials posted in this thread. Development and improvements are ongoing thanks to all of the contributors of these forums. I have selected some favorites that I would recommend: http://www.digitalhome.ca/forum/show...&postcount=304

Last edited by stampeder; 2011-08-21 at 02:21 PM. Reason: NEWCOMERS: please see Post #453 asap :)
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Old 2010-04-16, 07:04 AM   #2
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ota canunck: Your hor. patterns are like flower petals all over the place. Not much gain about 3.8 max.
CM Experimental Antenna Design
CE #933
GW 1 3 0 -1 0 0 1 0 0.005
GW 2 13 0 -1 0 0 -10.4 3.5 0.04
GW 3 13 0 -10.4 3.5 0 -1 7 0.04
GW 4 13 0 1 0 0 10.4 3.5 0.04
GW 5 13 0 10.4 3.5 0 1 7 0.04
GW 6 13 0 -1 0 0 -10.4 -3.5 0.04
GW 7 13 0 -10.4 -3.5 0 -20.4 -3.5 0.04
GW 8 13 0 1 0 0 10.4 -3.5 0.04
GW 9 13 0 10.4 -3.5 0 20.4 -3.5 0.04
GS 0 0 0.0254
GE 0
EK
LD 5 0 0 0 1.008e7 0
EX 0 1 2 0 1 0
GN -1
FR 0 1 0 0 584 0
XQ
EN
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Old 2010-04-16, 07:51 AM   #3
ota_canuck
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Well, that sure explains the multi-dir aiming behaviour.

At 3.8 I shouldn't be getting more than 20-30miles though.
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Old 2010-04-16, 10:04 AM   #4
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Quote:
Your hor. patterns are like flower petals all over the place.
On the high channels. On the low channels, its an interesting flat front dogbone type pattern.

Its like the bottom section of a GH with long stubs. The gain curve is centered nicely in the uhf band, so if you designed it in the dark, thats pretty good.

Reflectors should increase gain of course, and just maybe directors will work in this case. The trick is finding the correct spacing and size and shape of the first director.

Quote:
At 3.8 I shouldn't be getting more than 20-30miles though
Simple antennas are surprising sometimes. The Radio Shack Classic Bowtie (single bay clip on) has a gain of about 2.5 to 4.5 dbi, and if I position it just right, it gets some stations from 61 miles away consistantly. Thats another reason why mileage claims on commercial antennas are nonsense.
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Old 2010-04-16, 05:35 PM   #5
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It's a strange little beast for sure! but it's exactly what I was hoping to achieve to avoid the need for a rotor or multiple antennas ganged in 4 different directions.

My goal is to design a single simple antenna that will give me omni-directional characteristics that will reach the target markets for my area. These experimental antennas may not be suitable in all cases. I hope someone can build one of these Hawks and see is it works in other areas.

Go to my original post and check my tvfool and you'll see what I'm trying to acheive. My target markets are severely scattered.

As far as reflectors go,... this little antenna does not like to be near anything at all.

Quote:
Simple antennas are surprising sometimes. The Radio Shack Classic Bowtie (single bay clip on) has a gain of about 2.5 to 4.5 dbi, and if I position it just right, it gets some stations from 61 miles away consistantly. Thats another reason why mileage claims on commercial antennas are nonsense.
So, does that mean that a low raw gain on a simple antenna may be cleaner running than a complex antenna design?
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Old 2010-04-16, 06:48 PM   #6
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I think it shows more of the importance of location, location, location, heh.
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Old 2010-04-16, 09:27 PM   #7
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I tried this Hawk design with 7" legs, with 8.5" legs and with 10" legs.

The 7" leg design did not do well with VHF-hi reception.
The 8.5" leg design was pretty good for VHF-hi reception.
The 10" leg design was awsome for VHF-hi reception.

All of the leg size variants worked well for all UHF 14-51.[analog&digital]

So, the 10" Hawk design works quite well for me for all 7-51 reception and it's somewhat semi-omni-directionalish to suite this scattered market. The VHF capability is important to me because I have VHF12.x Erie, VHF9.1 [future CTV] Toronto and VHF11.1 [future CHCH] Hamilton.

You said it peaks gain at center of the UHF, so that explains why ION[23.1RF] is now coming in more reliable.
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Old 2010-04-17, 09:03 AM   #8
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ota canuck ,

Sweet little design . I`d like to assemble one out of 1/4" rod this wknd and have a few questions. First , are you running a preamp on this to get your Erie area ? What kind of signal strengths are you getting from there ? I`m asking this because Erie is my target market and we seem to have the same distance to Erie .
Did you use a steel mast ? If so is the ant. mounted right up to it or did you space it out a few inches ? I know this will affect direction of it.
I`m interested in giving this a shot . I`ve been trying to come up with something reflectorless for ease of building and longlasting durability . So far the best thing i`ve found was the GH10 elements with 5.6" stubs except it craps out just below digital ch 50. That one is a wanted ch .
Keep up the good work !
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Old 2010-04-17, 11:31 AM   #9
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loveota,

300ohn is right. It's all about location, location, location. It will be interesting to see what you can get out of this one. Post your tvfool with your results so we can compare. Good luck!

Preamp; wingard ap8780
No stand off is needed away from the mast.
Mount the non-conducting plastic mounting bar at the very tip of the metal masting.
If too much of the metal mast gets into the diamond's airspace it kills the antenna.

My Erie's are all roaming between 50 & 100%. depends on weather and lake fog conditions.

I tried to gang two antennas, but it didn't work. This Hawk seems to be a stand alone beast, it doesn't like company.
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Old 2010-04-17, 10:37 PM   #10
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Quote:
The 10" leg design was awsome for VHF-hi reception.
About like rabbit ears, which is better than most uhf antennas for vhf-hi.

Code:
Channel       Raw Gain       SWR
---------     -----------  ------
9               2.35        8.83
11              2.47        7.72
12              2.53        7.43
(actually, a little better than rabbit ears. Rabbit ears fair poorly here : http://www.hdtvprimer.com/ANTENNAS/comparing.html)
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Old 2010-04-19, 01:06 PM   #11
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Default Stealth Hawk

An amazing little antenna ota canuck !
I built it Sat. but Sunday the signals weren`t normal enough to try it but was very average this morning so i got it put up. Mind you bending 1/4" rod that much left me with large radius bends . I was surprised how well this small ant. recieves . My digital target is Erie. Vhf 12 matched my Gapless GH10 signal wise @ 64% and all my analogs came in with great picture . SunTV 19 ( my only local digital ) matched all other GH`s i`ve tried. Ch. 24 was weak @ 36 % and Fox 66 @ 38% . I need 30% for lock and no pixalating . Ch. 35 & 54 was no signal but i went up and gave the ant. a bit of a twist and then 35 came in but bad pixelating. For some reason my rotor isnt turning , i`ll check that out tomorrow and test some more .
Feedpoint is about 23' and using a CM7777.

http://www.tvfool.com/?option=com_wr...9c6b92873fd7cf



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Old 2010-04-19, 01:27 PM   #12
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Based on ota_canuck's comments and replies from others, I would sum up the best use of this antenna as:
  • Suburban to Fringe distance
  • multi-directional reception
  • primarily UHF, can be built with some VHF-HI capability
  • small mast space
  • easy construction
  • no additional reflectors or other elements work
  • no combining with other TV antennas
  • other good points or corrections?
Nice work, ota_canuck!
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Old 2010-04-19, 02:23 PM   #13
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It's a pretty cool looking antenna. Very inconspicuous to use in areas that frown on those big old antennas being mounted outdoors. It would be a great antenna for suburban attic or balcony installations.

The Stealth Hawk does not seem to have a distinct frontside and backside aim, so it's somewhat difficult to initially figure out what direction to aim the front or sides. 300ohm says it has a dogbone reception lobe pattern.

It really amazes me that with so little raw gain, so much can be recieved.

I'm going to try building one using a light gauge flat 3/4" aluminum. It might be a better choice of material just in case some big fat birds decide to come by and roost on it.
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Old 2010-04-19, 05:35 PM   #14
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Quote:
Originally Posted by loveota View Post
... Ch. 24 was weak @ 36 % and Fox 66 @ 38% . I need 30% for lock and no pixalating .
You're getting ~ -12NM and -21NM channels with this?? I'm wondering how this can be, but you've definitely piqued my interest enough to try this simple build ... what's to lose? .
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Old 2010-04-19, 07:13 PM   #15
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Default Simplicity!

I built the first one for a lady who just simply wanted a small window sized antenna for receiving Buffalo channels from her apartment window. As a lark, I threw it up onto my tower to see what it would bring in.

For an apartment window, [being such a simple design] possibly metalic tape layed right onto the glass would do the job. Imagine what results you may get being 20 stories high and having this taped on the window that faces in the right direction.
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