Did you put it next to the fuse box under the hood? The underhood fuse box is right next to the alternator which puts out a lot of electrogagnetic waves. Try mounting it in the trunk where the antenna is.
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Brent I. Adams '98 Silvermist GTP Coupe Poly bushings, Thrasher airbox, tranny cooler, 3.4" pulley, U-bend replaced, F-bar, Blazertech 2200's, Crossover wrap, Rat heat shield, Borla tips, Taylor wires, NGK TR55's, stereo stuff