Yes, a portion of your ADS-B "out" transmission identifies which frequency receiver you have in the aircraft. Ground Stations will know which frequency to transmit the 'Re-broadcast' information to you. For example, if you are equipped with a UAT 978 MHz transceiver, then you will broadcast ADS- B data to the ground stations, part of which identify which receiver you have in the aircraft. With that information, the ground stations will re-broadcast back to you the area 1090ES ADS-B targets, as well as Legacy targets being sweeped by SSR (Secondary Surveillance Radar), assuming you are receiving all 978 (UAT) targets directly (Air-to-Air).