CB Radio
I have always loved CB's. I grew up around the trucking industry, and even though I own a Cell Phone and generally wouldn't need a CB, I had to have one.
I purchased one of the old trucking standbys, the Cobra 25 Nightwatch. I had owned a regular 25 in the past, and treated myself to the fancy glowing one this time. It looks cool, works well, and is a pretty good way to communicate.
I installed a K40 stiff antenna in the rear bumper, as well as a Cobra Talkback speaker and a Bullhorn for the PA under the hood. It is fun to torture my friends when I pick them up by hooting and hollering on the external PA.