I am trying to get some radio reception in my 2000 S4 - it had a rear window replaced prior to me buying it - the diversity box under the cd changer bracket is there and hooked up - there are 4 antenna amplifiers (2 under the rear window deck and one on each rear pillar) - there is a cable going from the diversity box to each antenna amp, but nothing plugged into the other end of the amps - is there a cable missing from the window to the antenna amps? - if so does anybody know a part #?

Thanks