Audi Gamma Radio Questions - 92 100S

[Karl Nitz-GKN001 <Karl_Nitz-GKN001@email.mot.com>]

     I am preparing to install an aftermarket stereo system in my 92 
     100S.  In first looking at the connections to the OE Gamma radio, 
     it's clear that the front speakers are powered from the radio, and 
     the rear speakers have an amplifier on each speaker.  I'll be 
     running my own wires, so this won't matter, but...
     
     What is the explanation for the 2 "antenna" connectors?  It looks 
     like there are two connectors for the antenna in the back of the 
     radio.  I haven't pulled them off yet, but any explanation of the 
     connections would be helpful.
     
     On a different note, I used information from earlier posts 
     regarding Bosch O2 sensors to save $220 on replacing both O2 
     sensors on this car (the cheapest I could find the OEM part was 
     $150@).  The generic Bosch number for the 92 100S is 13913.  All 
     that was required was to solder the sensor wires to the Audi 
     connector.
     
     Regards,
     Karl H. Nitz
     gkn001@email.mot.com
     
     '92 100S, 72K miles - just purchased 9/28 :)
     '97 Sebring LXi, wife's "German" car
     '81 VW Rabbit Diesel, 196K miles - daily driver
     '86 Kawasaki ZL600 & '85 Honda VF500F Interceptor - away for winter