Hey Conway,
Just my two cent but did you ever look into the Airave or is it your area in whole that has a weak signal? I'm a Sprint Corp tech and we see the issue EVERYDAY!! We just show-n-tell the Airave, tell'em they have 30 days to try it out and see how it works for them. We may get 1 out of 5 returned and thats mainly cause they just wanted out of the contract period.
Maybe you do/don't know, but if you dont, it works off you existing hi-speed ISP connection using one of the ports. Basically, you'll have your own personal Sprint tower in your home. Also it'll allow 3 users to connect at one time, pricing info at link below. But this is only for voice services(calls and vm's), SMS/MMS/E-Mail data only if you have a 1x/Ev signal.
The unit itself is $99
http://www.nextel.com/en/services/airave/index.shtml
Again just my two cent, hope this helps anyone that may have/had similar issues and wasn't quite sure on what to do.