To be honest with you, I have bought a cheapo unit from factory direct and any frequency I use on it works great with me. It doesnt' matter if I choose 88.1, 103.5 or Q107 for that matter it kills the outside signal. So what I'm saying is it depends on the unit that you use, how good it is.
that's my two cents.
I know it doesn't answer your question, but if you're getting that bad a reception I would consider trying another device.
that's my two cents.
I know it doesn't answer your question, but if you're getting that bad a reception I would consider trying another device.