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FM is received best with an antenna designed for FM frequencies, 88 to 108MHz. The RCA ANT751 is designed for TV RF channels 7 to 13 and 14 to 51, 174 to 216MHz and 470 to 698MHz. The elements on the ANT751 are too short to offer any gain receiving FM stations. An antenna like the FM6 on a rotator would be better for FM radio. If you wanted an omnidirectional antenna, a FMSS would work, but it would have trouble with stations that have a co channel warning flag, because it would not offer any rejection for signals from unwanted directions.
Also, from the FM fool image you linked to, there are two strong signals on 107.7 within 66 degrees of each other. The first is KSAN, the second is KSAN-FM1. KSAN-FM1 is an on channel booster for KSAN, depending on how they are synchronized it is possible they could be adding destructively at your location.
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