At least you don't have the problem I'm having with my new 6,700lb 10' long `new toy' and trying to figure out how to come up with a `mount' of some kind *and* dealing with a 6V *positive* electrical system to try and power my PSR800! {GRIMACE!}
I just picked up a 1960 Ford 861 tractor today and while I *could* convert it over to a 12V negative system it, otherwise, works/runs quite well with the original 6V positive system and I don't, at least for now, forsee making the conversion since I don't think I'll be needing a `mobile antenna'. But, I would sure like to hear about any sort of `adapter' I could use to provide the necessary USB 5V power so that I don't have to depend upon the scanner's batteries all the time.
Yeah... I can hear you all wondering just *why* one would want to even try to listen to a scanner while on a tractor. I figure that a pair of `hearing protector' headphones with an external audio souce connector will both help me keep what little hearing I currently may still have and listening to my local `authoritities' is a lot more `interesting'/`entertaining' than what one finds on `commercial' AM/FM radio these days. {VB GRIN!} I can also program in our farm's 2-way freqs and be able to hear when SWMBO `hollers' at me and then use my HT to reply if necessary.
I already have pretty much gone to using my PSR-800 as a mobile in pretty much everything else `mobile' and it seems that getting around to using it on my new/`used' tractor kinda fits in? I get to listen *and* not have to worry about someone stealing it because they've seen it as I can easily take it with me and remove the opportunity from them.