Just bought a Trimble 250 guidance system with a patch antenna and the optional AGS-15. I'm going to use my JD 4450 to pull my 40 ft boom sprayer and need to figure out how and where to mount the AGS-15 antenna. I have the mounting plate with the adhesive strips which I could stick in the middle of the top of the SG cab. I also thought about building a steel pipe or angle iron pole with a steel plate on the top which I could bolt to the back of the cab and it would be long enough to be above the cab. I can also build or buy more steel plates to use on my other tractors if I decided to use a smaller tractor. I wanted to use the 4450 as the cab is very tight and would keep out the fumes, has room in the tray for the remote controller, and also has a rear view camera. Will be doing some spraying in Feb which could be a bit cool for open station tractors and my other cab tractor is too big. Any suggestions would be appreciated.