The SSTRAN AMT3000 has two jacks on the back so you can plug a stereo cable (eg. 3.5mm jack to two RCA phonos) into the back – it combines them into a mono signal. You could indeed buy two AMT3000 units and transmit a channel on one frequency (on one unit) and another channel on a diiferent frequency on the other and receive on two separate receivers for stereo. No really sure I see the point thought… I undertand the AMT5000 has a better matching arrangement to allow its output to be better coupled to an antenna and therefore increase the range, plus some improvements in the audi circuit. Not worth the extra dough in my opinion.