If you are going to listen to the radio you will need a Antenna.
You can Buy a aftermarket fixed mast car Antenna at a car parts store for a reasonable price or you can go to a Auto salvage place and pull out a power antenna for a good price.
I had a power Antenna laying around so I installed it on the computer case.
For the antenna you will need to drill a hole in the top of the case. BEFORE YOU DRILL.
Make sure you have enough room to mount the power antenna.
Power Antennas need a 12 volt power wire, a ground wire, and a signal wire. The 12 volt power wire will be attached to the YELLOW power wire. The ground wire will be attached to the BLACK ground wire on the power supply and the signal wire will be attached to the stereo.
On aftermarket stereos the signal wire is typically blue or blue with a white stripe.