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Interesting issue, but I think 16ACE27 is correct in that most likely the antenna switch is powered from coach battery and the manufacturer would not duplicate power feeds to each battery bus (with isolation diodes) for a TV/antenna switch.
So if you are still getting power when coach disconnect is off (assuming the coach disconnect latch relay is actually open and you are not on shore power, gen etc) then the only way to power is from chassis battery via the “Aux start relay” as noted on your 12vdc drawing (also called battery isolation relay). I also noted that your Winnibego drawings do not show a chassis battery disconnect as factory equipped, so you must have your own chassis disconnect switch you are using in your tests (or the drawings are wrong)?
One way to test the aux start relay (isolation relay) would be to operate and release the emergency start switch and listen for the relay to operate and release. This assumes that this relay is not already held on (operated) by some other electronic control system used for normal battery charging interconnect control......but you are not charging.
I am not familiar with your coach, but a voltmeter across each battery (coach and chassis) to ground would measure the same voltage on both, if the aux start (isolation relay is on/closed) and battery loads are small (very small voltage drops on battery cabling involved). You could also disconnect a coil control wire from the Aux start relay which should prevent that relay from operating at all......unless its main contacts are fused together. Make sure you reconnect when testing is done of course.
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