I use a Sangean ATS 505 shortwave radio (cheap, and lets you listen to all of the shortwave spectrum, not just the broadcast bands), with a wire antenna attached. That's literally a wire, strung to a tree outside, with a headphone plug soldered to one end so I can plug it in the external antenna socket. Works fine, though with a lot of static. I'm in Western Europe, so the signal is decent by night, unaudible by day.
The thing about the broadcast bands is important: most cheap shortwave radios only let you dial into specific "broadcast bands". The Buzzer (as well as most other interesting stuff) does not broadcast in one of those bands, so a normal world receiver can't pick it up.