OK, I'm going to get a dozen posts advising me to buy a cheap bearcat scanner for $10 at a yard sale to do this, but I really don't want to do that. What I'd like to do is build a "box" with one button that turns it on and off. When it's on it's monitoring the local CTAF frequency. When it's off it's not. Reading about homemade ADS-B in receivers this seems like it should be relatively easy to make using a raspberry pi, software defined radio (SDR) receiver, project box, power source and a speaker. Any advice on how to make this project come together, or where I might get help with the software? Seems like it should be simple? Can SDRs receive AM VHF? Do LiveATC feed providers use anything like this?