Caveat: I'm a ham, but not an expert. The answer depends on what you want to do or explore. You have many different options, including RTL-SDR type USB dongles

Caveat: I'm a ham, but not an expert. The answer depends on what you want to do or explore. You have many different options, including RTL-SDR type USB dongles for use with software like SDR# and gqrx.