FM Radio intermittant squelch or static

I listen to NPR, fortunately the Bay Area has several stations - my favorite, KQED is at the lowest end of the FM band, 88.5 for some reason, my radio or antenna or something is causing a very loud and obtrusive squelch or static to overwhelm the station - when I switch to KALW (91.7) it’s not there, back to KQED, still going - so this is something that only affects the lower end of the FM band - what could it be?