Reply: Ham radio on a scanner
The other replies posted so far all offer good advice. I wanted to mention the possibility of listening on a portable shortwave recceiver instead. It all depends on how and why you want to monitor these bands. A scanner would let you search for frequencies in use, but as someone mentioned, you would be limited to FM and AM only, and on some scanners, just FM. But many short wave and general coverage receivers also allow you to listen to single-sideband mode. If your main interest is to monitor ham radio signals, you could buy a cheap used ham radio (but it probably wouldn't ne portable) and pair it (as someone mentioned) to a proper antenna for receiving in those bands. A rubber duck on a handheld scanner might give good results in the vhf/uhf police and fire bands, but is far too short for the Low-VHF and HF bands, Some ham radios also have search and scan functions like scanners do. You didn't mention if you are a ham or not, but if not, you don't need a license to listen to a ham radio, only to transmit. If you decide to get your license, you will already have a ham radio if you go that route! Enjoy!