: Stacking, Ganging, Combining TV Antennas
2012-04-23, 04:40 PM
^^^That unit is for UHF only. On top of that, it is made in Europe, so will likely have their 8MHz channel spacing instead of the 6MHz spacing used here in North America.
Back to balm's original post, if the antennas are pointed in the same direction, what is to prevent the VHF-HI antenna from receiving the strong VHF broadcasts that you are wanting "moderated" by using a UHF antenna. For strong local broadcasts, a notch filter is your best option that.
Edit: If it is only one weak VHF-HI station you are wanting, you can use a Channel Master Join-Tenna to combine the antennas. They are available for most channels from the PCT store.
2012-04-27, 04:10 PM
Can I combine a VHF-Hi yagi (used for only a single weak VHF-Hi channel) to a UHF antenna (used for moderate UHF channels and 2 strong VHF-Hi channels), pointed in the same direction....using only a standard splitter in reverse ?
Try using a Join-Tenna for the weak VHF. It will allow the UHF antenna to get the strong VHFs, but when you tune in the weak one, it will use the real VHF antenna.
But hurry if you want one- CM stopped production a few years ago and the supply is running out.
if the antennas are pointed in the same direction, what is to prevent the VHF-HI antenna from receiving the strong VHF broadcasts that you are wanting "moderated" by using a UHF antenna. For strong local broadcasts, a notch filter is your best option that.
I should clarify, the 2 antennas will be pointed in the same direction, that is towards the single, weak VHF-HI, and moderate UHF channels (from the US). But, yes the yagi will probably pick up the strong VHF-Hi channels even though they are more than 60 degrees from the weak VHF-HI channel
2012-04-29, 04:39 PM
^^^Then I recommend using a UVSJ to combine the antennas. This will take only VHF frequencies from the VHF antenna and UHF frequencies from the UHF antenna. This eliminates internal reflections reducing the combiner loss and also prevents phase interference between the two antennas.
Thanks, I will have to verify how well a #13 yagi, will pickup the strong, off the side, #10, #12 - but I suspect t would be easy
I will let you know.
2012-04-30, 12:43 AM
It depends how strong, but it should be fine. The thing about Yagies is from the side the reflector and directors don't have any affect, so it behaves like a folded dipole would from that angle.
2012-05-15, 09:36 AM
is it possible to amplify one antenna and then combine it with a 2nd antenna?
i'm looking to amp an antenna towards buffalo and then combine with an antenna towards toronto. or should i just combine the antennas and then amp that combined signal because amping just one will cause issues as far as phase etc?
2012-05-15, 11:51 AM
^^^In general this is a bad idea. The antenna you have pointed towards Buffalo will also receive signals from Toronto at a reduced level. The amplifier will likely boost these signals enough to interfere with the un-amplified signals from the other antenna.
2012-05-15, 12:02 PM
ok, so best to just combine the antennas and then add the pre-amp at that point and thus boost both, right?
2012-05-15, 01:51 PM
Yes, that would be better, though not without its own disadvantages.
2012-06-03, 06:29 PM
Hi all, i'm planning on placing two 91XG OTA antennas on a dormer on my roof, the dormer is a fair size. One antenna will be used for my living room the other for my bedroom, i was wondering how far apart i should space them from each other so there is no interference. Also i have an FM yagi that is a fair size, how far should it be away from the 91XG antennas, thanks. :D
2012-06-04, 09:45 AM
Why not use one 91XG and split/amplify?
2012-06-04, 11:33 AM
I would be splitting to 3 tv's then as 1 of the antennas will be going to 2 tv's
2012-06-05, 04:21 AM
Use a pre-amp or spltter amp if required. But you'll only be taking a 1.5dB hit vs two outlets, which isnt likely to be a problem (unless you have some borderline stations).
2012-06-05, 11:04 AM
^^^Agreed. A pre-amp's primary job is to amplify the signal where the signal is strongest (at the antenna). After the pre-amp, splitter loss is irrelevant. You do need to choose your pre-amp wisely, as they are not a one size fits all (see the amplifier thread for details).
2012-06-05, 02:54 PM
not only is there the expense of buying two antennas (and mounts!), but the time to install them both. Plus two separate coax feedlines. And two ground drops. That's a lot of overhead, especially unnecessary if both antennas are aimed the same.
Installing a preamp at just a single antenna will not only provide enough signal for you to divide it several times to distribute to multiple TVs (after you get the single coax into the house), but also overcome the loss of your cable run, which could be significant on the upper UHF channels.
2012-06-05, 09:46 PM
Yep, this raises the point of why we typically stack or gang antennas, which is for specific gain or aim requirements.
In totallyr's case a single antenna should do just fine with the proper network of amplification (and attenuation as needed) and splits.
2012-06-05, 10:32 PM
Thanks guys and i'm taking the advice on going with 1 antenna plus the preamp, now i have to figure out how to turn the rotor on the telivision that doesn't have the degrees led display and the remote. Other than that i'm all set, glad i came for advice, saved some money and a probable rooftop eyesore, lol. :)
2012-06-06, 01:21 PM
^^^One option is to get an IR to RF extender (or an RF universal remote).
2012-06-06, 02:08 PM
I have this Powermid transmitter and receiver from years ago, i'll give it a whirl