AND due to the field being the bottom of the "bowl" surrounded by these foothills....it can easily become a tracking nightmare!
With all the metal silos , sheds, barns located on the sides of these hills, there is a tremendous amount of interference. I know way too many flier's who have lost rockets, using both GPS and RF tracking. Depending on where you land, signal can be lost, totally false or more than 180 degrees off. You need some serious experience in locating, to find them.
I have personally been out on hunts for myself [and others 6 times now] lasting from 3 -8 hours to find a rocket. We have gone to spots where GPS said it was, but when we got there it would re-plot to somewhere else...several times & no rocket!
I have no explanation for false GPS readings but that doesn't change the fact that 3 times I personally could not locate them or they weren't where they were supposed to be.
I think it would be HIGHLY advisable to do a test flight there, with a much smaller motor [5-6000 ft] to test your "locating" skills before risking the entire project. The test would reveal any flaws to your recovery set-up & what kind of drift you are in for.
Good luck, and please understand I'm not down on your attempt. I wish you success, but part of that is knowing what you are up against! You got some money wrapped up in those electronics and a test flight will increase your chance of getting your money back 10 fold at this field!