I run a lot of different machinery on our place so I have a Sirius/XM radio with 2 docking stations and a stereo box.  I keep the docking stations in the sprayer and whatever else I happen to be running.  I also have three sets of antennas, and power cords and I keep those in the three most used machines.  I also have two of the aux cords.  I recommend aux cords if the radio in your equipment is new enough to have an aux port.  The stereo box I keep in the shop.  Sometimes I will take it with me along with an inverter to use if my other two docking stations are being used.  I used ebay to get everything I have including the radio.