bad FM radio reception when wet

[boneca]

since last week, Tuesday to be exact, I'm getting pretty bad or no radio reception while raining, or going thru car wash, also sometimes the station skips even when its dry, I tried to look around with no success, does anybody have suggestion what to look at? I really hate to drop my car at the service again due to bad radio reception but I will if I have to.

phone, Sirius, navigation, etc., works ok, I assume this has to be antenna issues somewhere.

[boneca]

bump