You can probably do it with microwave or laser, maybe public-spectrum microwave (like SyLink).
How fast does it need to go? what's the terrain like between endpoints?
What's the weather like in your neighborhood? (Snow, heavy rain, Dust....).
How critical is the connection? if you need five 9's, you're probably SOL, if an occasional drop out won't bother you too much, it's not cheap, but it's no big deal.
Scott