I would advice you to contact both stations tech departments directly and talk to their engineers with more details, they will likely help you. Channel Vision manufactures all sorts of traps so search for that company online if needed. You must be using some sort of amplifier that is being overload by the strong close stations because ATSC tuners are designed so in their first stages they adjust their filters to filter out unwanted adjacent signals otherwise you would see people who lives nearby transmitters complaining they get no reception , and that is not the case.