knoydart

You should be able to get the comms from aircraft to air traffic control and vice versa. Usually the frequencies are around 118 - 130 MHz with AM modulation. A quick use of your favourite search engine along the long the lines of "what is the approach frequency of airport X" should bring up a frequency or two for you to start attempting to receive. Most of the SDR receivers will go well over 1000 MHz (hence the reception of the ADS-B signals at 1090 MHz) so get out and have a play.