radio signal strength tool for PC?

I had an idea for the carputer I’m building. I’d like to somehow monitor radio signal strength thru it that you can monitor by channel. In a nutshell, what I’m looking to do is monitor, say, channel 9 and know how far away the signal is based of it’s strength. So more or less, it would be like a built in radar detector.

anyone know of such a program? I did a quick search but didn’t find much