Thank you guys!
Yellow/black is the mute wire according to the diagram. Would you not agree that simply tying in the connector (A35) in the trunk (which is supposed to accept the receiver) would make for the simplest installation. It gives access to switched and unswitched power, connection to the front speakers, radio mute, and the wires to the microphone (altough a microphone must still be connected to those wires). . .
Is the stingray antenna like the one at this link? http://www.powercallsirens.com/antennas.shtml
Sorry to bother you. I sincerely appreciate your help!