If you already have a BatMan (Batwing/ Wingman combo), there's not allot more to do unless you just want something shiney. Pulling new RG-6 May or may not make a difference.
Quartzsite can be tough though. There are lots of folks in town running this Chineese looking thing on a standalone mast watching both Yuma and PHX. I have no idea how the southern LTVA's are, but as mentioned earlier, I have tried every year up off of Plomosa looking at the band with a real spectrum analyzer, and there is simply no signal to be had. Whatever knife-edges into town seems to fall off quickly.