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Thanks, GUM,
I'm not used to reading TV specs. I had that doc, but could not reliably interpret it.
One drawback is that I cannot manually tune the TV to a digital channel. If it cannot find it in an automatic search, the channel effectively does not exist.
I figured since the two main radials I want are separated by much more than twice the 30 degree UHF 4-bay beamwidth, that the two antennas (one at 200 degres and one at 300) would sum together OK. Is there something special about the modulation that makes this problematic?
I think a 10 ft antenna would need replaced 3x a year here, so the 7698 is out of consideration for me. A smaller roof mount antenna might survive. Since I get many CoSprngs channels with an in-room antenna I don't think I need heavy metal. Your comments on snow load are well taken, but that is a very rare condition here. The wind blows the snow off the roof except right in the valleys.
In my work I'm used to seeing full specs on devices, so I'm mystified by the missing info on the combiners and couplers for TV. Here's what I typically think of for a typical power divider/combiner. Since I'm not interested in spending $130 for the coupler in this project, this info is moot. I cannot find any info on the port isolation for any of the cheaper TV combiner/splitters.
I guess if I put an amp in line between the antennas and the combiner they would supply the isolation. What's a good, cheap low gain (12 dB) amp.
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