Where I live there are basically no usable GMRS repeaters, that I have been able to find. I intend to fix that when I find a decent site for my repeater. I'll follow my understanding of the Open Repeater Initiative, since I have not been able to find any published guidelines.
Let me preach on it, brothers... *ahem* (cough, cough) I mean, here's what I have in mind:
I'm near the US Hwy 72 corridor, about 20 miles east of Huntsville, AL. The nearest town is Gurley. There are repeaters in the Chattanooga, TN area, but they don't reach here. There don't seem to be any repeaters in Huntsville, nor in fact anywhere west along 72 until you reach the Memphis area. I can't do anything about that. But there are a couple of 1600'+ mountains just on the outskirts of Gurley, and if I can find a site on one of those mountains I think I can cover most of the area from Huntsville to the fringes of Chattanooga coverage.
My repeater will be open to all licensed users who don't abuse the privilege. PL will be 141.3 and the frequency pair will tentatively be 675, although that is subject to change if I run into interference.
I'm already putting the gear together and will test it at my very subpar home qth, and am looking for a better site. If anyone knows of a good site, I would like to hear about it. I don't necessarily require mains power since I plan to use batteries and solar.