I would try to get Speednet to come out for a test. Our local Wireless Broadband ISP, kept telling me that I wouldn't have line of site, but they finally came out for a site test and found that I had excellent signal strength (and could get up to 3 Mbps if I wanted to pay for it).
I have 768Kbps up/down over radio waves and it's excellent. Much more expensive than DSL, but since Dialup or Satellite is my only other option it's the way to go.
That being said, if I couldn't get radio, I would have gotten sattelite and dealt with the latency (from what I'm told, don't look to play games or use VPN).
Heck, I would have put a tower in like getut if I had to.
Good luck.