Alltel tower conversion

If anyone knows when AT&T will be finished merging Alltel's service coverage to their own in southeast Georgia I would love to know. I have scoured the net for solid dates and any information about it. I use a Nexus 5 and the only way for me to get any decent LTE coverage I must use AT&T's network. The only problem with this is that at my home AT&T has no signal of any kind within a ¼ mile of my residence. My wife is still on Alltel's network with a Samsung Showcase which gets signal okay thru Alltel but not great. I hope that when AT&T finishes converting Alltels towers to 4g that I will begin to get some kind of signal at home. We live in a rural area so I don t expect full LTE signal at first, but at least HPSA so I can call and text would be nice. I enjoy my Nexus 5 and the saving that come with not being on a contract with Verizon (or any other carrier) and having to shell out at least $500 (since I bought the N5 unaware of Verizon's beef with Google)to buy a decent phone that is compatible with Verizon's LTE bands. The only two cell providers that have any signal at my house is Verizon and Alltel. Sorry for getting long winded, I am just trying to get the most out of my GoPhone plan and my N5( which so far has not been disappointing for me). Thanks for reading!
Cheers,
MDAMIKE1979