It's just for farm use, just to keep in touch with during seeding/while doing field work.Interesting,what are you using the radio for? Where did you put a antenna?
Yeah the only thing in the kit that is worth anything is the coax and NMO mount, the wiring is shady at best,I didn't know John Deere had a radio ready package. That is a great looking setup.
The cab is really quiet, but the HVAC fan sounds like a Boeing is taking off inside the cab.Initially I would assume that the tractor would need some barrier insulation to hear the radio, but from your pics, it looks like JD builds their tractors as well as the standard automobile industries.