just the connection, and the scan of your TVs to 'cable' should work, no need to push any buttons, as the button is only to energize your roof antenna, not Cable.
if you have a 'box of many buttons' above the living room entertainment center/cabinet, then you will want whichever TVs on 'Cable' that you want to watch cable tv on.
it's doubtful that you need any type of 'box', unless the park's Cable system requires it.
also, all three TVs should be wired to either Antenna or Cable, and should work just like all the rest, whether outside or inside : )
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the Turners...
two Campers, two Electric cars
former diesel pusher traveler
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