If I had that antenna in your location I'd aim the VHF antenna section toward WMUR and the UHF section toward Boston. Next I'd eliminate the twin lead and add a second balun for the other antenna. Finally I'd switch the RCA preamp to separate VHF/UHF inputs, and feed the two antennas into the two inputs of the RCA preamp. This may not fix the problem, but it would eliminate the possibilities that both FM overload and strong signals from WMUR might be causing the problem with WHDH.
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