This is being discussed elsewhere. First: you have the cables, Are they in good condition, the crimp on ends FIRMLY attached and the center wire the proper length (not trimmed too short) Your selector switch, a wall plate (if so it is possible one tv is getting 2-4 times the signals) or a matrix switch (Box of many buttons) the BOMB is noted for bad switches needing cleaning.
Coax is often cheapest bidder and splitters if used likewise, this can lead to interactions between the TV's.
A fact I once used to make a filter to get rid of an interfering station in fact.
Home is where I park it!