As some of you would know I have a fleet of ex-military Land Rovers (11 in total) and I also like to listen to music etc,. whilst driving or stationary, so in keeping
with the military theme I mounted a radio/usb type thingy in a 7.62 Bren magazine box, it has a 6 foot cable which has a marine coupling on the end, to plug into
power supply, you could also use a cigarette lighter type power point, it works very well

it also has provison for an aerial via a PL259 plug on the top of the box, inside the box it has a small 12 volt gel storage battery so it doesn't lose it's memory
anyway cheers Dennis