Hello. I have two suggestions that might help your situation.
Assuming you work indoors and that it degrading your signal, you could get a "booster" (no, not those cheesy stick-on things from TV). I live in a "black hole" for cell reception and purchased a Wi-Ex Zboost signal amplifier. There are different models and also other companies that make them. Basicall it's an amplifier. You put a foot-long tube on your roof (or probably in your case, you would need a directional antenna) and run coax into the area where your home office is. Here is a link that should help. http://www.wi-ex.com/solutions.aspx You can get add-on antennas so you don't necessarily have to get the professional model.
The other suggestion, since you indicated a willingness to change providers, is to go with a satellite system. Probably the most expensive system, but just another suggestion.
Good luck. Hope that helps.