WSPR 2m TVI
#12
Whats the grounding on your 2m antenna & TV antenna like? Have you tried a 2m bandpass filter on your transmitter? How far is your half wave vertical physically located away from your TV antenna?

As Peter said, I think it's overload on the masthead preamp. Try another antenna without the preamp. I've found the log periodic design to work well, even down at VHF.
There are many things to try before giving up. It would be good to have another 2m WSPR station.

Also another thing to double check is that your WSPR TX signal is clean (not being overdriven etc)
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