A used 3.5 mm to 75 Ohm FM Male Plug Adapter for Bose Wave AWRCC 1 to 7, Series 3 & 4

The Bose Wave AWRCC 1 to 7 and Series 3 and 4 Wave Units use the Mains Cable and House Wiring as the FM Aerial.

If that configuration proves ineffective you can plug an external FM aerial into the unit for improved performance.

A standard coaxial aerial plug will need a converter lead to connect to the Wave's 3.5 mm FM input.