RV Stereo Antenna cable issue

wa8yxm wrote:
I know the relation between TV and FM bands in fact pre-digital I'd often tune in Channel 6's audio carrier on FM radios).

But I'm not convinced of the adjacent channel interference issue. Normally if there is a channel six the FCC does not assign 88-90 MHZ in the area. Of course now the FCC is trying to discourage the use of Channel six for TV.. they want to re-sell the spectrum to other services,, but that's another issue.

That said, Filter/block or just not amplify.. All have the same results.

My understanding is that only the VHF HIGH BAND 7-13 analog)is now allowed for ATSC OTA. 2-6 were removed from active TV broadcast with perhaps the exeption of some analog "translator" transmitters which were grandfathered for a period of time after the ATSC mandate.

That is pretty well reinforced by the mere fact that antenna manufacturers are no longer making TV antennas which reach the 2-6 channels and even finding a TV/FM antenna has gotten rather difficult since many antennas are now cut for 7-13 VHF HI and 14-60 UHF..

In the olden days of analog TV there was indeed problems of interference from the FM radio band when in or around large metro areas where you have all VHF channels filled and even the FM channel alotments filled.

But keep in mind that there ARE a lot of frequencies between the FM radio and Ch7 TV which include amateur radio, Fire, Police, Business, Airline/airport, national weather service..

The decision to not amplify the space between 6 and 7 was up to the antenna manufacturer and depending on how much gain (or lack of gain) which affects the directionality of the antenna it may have been a good thing.

Generally you only see the space between 6-7 not amplified on small antennas which often were nothing more than a dipole..