We used to do a lot of this kind of thing, and it works well...the only problem with basic 802.11 repeaters is you lose bandwidth each time. We were getting around 40-50% bandwidth lost with each hop.

Depending on what you are allowed to do there, you might find using a licenced band allows you to go for very high gain antennas and run it in one hop - which is the way power and telco folks tend to do it.

The 5Ghz band is good, bud sadly has a shorter effective range than 2.4Ghz, and you probably won't get too much 2.4 traffic if you are as far away from civilisation as it sounds.