The only reason they say metal is because the antenna is magnetic. Metal is not required for reception (at least on the Delphi). I have service with XM and have the Delphi SKYFi radio. In most vehicles I simply put the antenna up on the dash and it works great. I have not tried it on the Jeep yet, but with the mostly vertical windshield it may not work very good from inside. The first place I will try is the front cowl... right in front of the windshield. To mount it on your hardtop (which would be best reception), you would need some double sided sticky tape.
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20 years ago