I think that your choice of antennas is good as is your mounting location. I agree with rabbit that you need a preamp. I'd assume that the one that you tried was overloaded by FM, had too much gain, was faulty, or was installed wrong. I'd try a TVPRAMP-1R with the FM Trap on. You could also try an external FM trap between the VHF antenna and the VHF input of the preamp.
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