I could try to explain what the HD communication product HD26200 is, but a quote from Business Wire sums it up beautifully. The HD26200 is a "complete outdoor wireless network bridge in the 802.11b/g unlicensed 2.4GHz band that sells for only $318."
The range for the wireless network bridge? A very impressive 5 miles. The only real catch is that the two points must have a line of sight connection. But, for a 5 miles $318 solution, that should not be an issue. (If it is, the company is working to expand their non-line of sight units).
Aloha from the Beach