. . . . you should stay at least 2 channels away from the actual broadcast channel used locally. Example we have a fox 4 but they actually broadcast on ch.35 so channels 33 to 37 would be unusable.
This is exactly what makes assigning TV2 channels - and especially mixing the TV2 feed with an off-air antenna - so problematic now. Since the digital transition, most stations no longer use the same frequency as their station number. Where I'm located,
none of the channels are still using their previously assigned frequency. Closest two are Channel 30 (RF 31), and Channel 46 (RF 47). Others, like Channel 2 (RF 43), use much higher frequencies. All of our old VHF numbers (2, 4, 5, 9, 11) now use the higher UHF frequencies.
One reason mixing the TV2 feed with a cable from an OTA was never recommended by DISH, is that it would be possible (though highly unlikely) for you to actually
broadcast your TV2 feed over the air through your antenna. In theory, a neighboring home could pick up that signal through their own antenna. Now, we tried all kinds of experiments to see if we could make that happen, and were never successful. But, the FCC demands that our systems create NO interference, so that configuration was "not allowed". We weren't even supposed to hook up the remote antenna on the TV2 cable without installing an attenuator for that same reason. Shouldn't be a problem anymore, as very few people are still trying to tune analog signals.