You definitely have to run an antenna or tap an existing on (I tapped my HD antenna)... once done it's flawless.

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the REAL Shaka Zulu
My X5 Page: http://www.xoutpost.com/userpage/RealShakaZulu.html

Silver w/ Black Interior
'03 4.4i w/ Sport & Winter Pkg
ClearBra, BimmerSpinners, XM Radio, Pirelli Scorpions, Thule Rack (Snowboard), ADS Amp, MB Quart (front), Focal (rear), JL Subwoofer, GG Bailey Custom Mats, Dension Ice>Link, ACS Pedals