I bought a short antenna from Discount Auto Parts for like $4.98 its a cellular style. It came with adaptor peices so all i had to do was unscrew the old and screw in the new one, to me the stations seem clearer with the short new one. If i get a chance ill post some pics.
I was think about the antenna on the L200 and L300. Its mounted on the back part of the roof. I was thinking about geting one of those and sticking it back there. I can't stand the stock antenna its such old tech it went out in the 90"s come on GM lets get something a little better.