Around here there is not a lot of tree problem.
Instead your problem is a lack of coverage per tower because of distance to the site then. At 2.7ghz you need more power to cover the same area as at 900. Licenses usually prevent you from playing the power game.
We are a Clearwire market
Most of the Clear markets are in places with people. I'm talking about Rural America. They're not hurting for options in Atlanta or Vegas...
I used to have it at my house before cable/DSL arrived here.
Proving my point that places who have those options shouldn't be wireless Internet markets...
They use directional antennas on the towers so they are able to do wifi in a bunch of directions at the same time without interference.
I suspect they're using Sectored antennas, like we're using in our higher capacity 900 markets.
It helps concentrate the signal in a given direction, but it doesn't make the issue problem-free by any stretch. When you're dealing with the unlicensed band, it's basically a free for all. The licensed bands aren't super big either and the cost is generally prohibitive.
They get 5-10 mile range from the towers.
In the rural areas that I'm talking about, 5-10 mile range may get you 10-20 customers. Our 900 sites have a max of 20 miles and some of them have 20-30 customers. These are places that the only major slice of Internet is a T1 line.
It's not worthwhile to cover 10-20 people at a cost of 10 grand (for the site, plus CPE, installations, etc.), unless there are grants, unfortunately. It's a very front-loaded business.
The rates are low, around $40/month. Small towns are putting the antennas on top of their water towers.
That's around what we charge (45$).
We install on water tanks, municipal towers, sometimes co-location with radio stations or cell carriers as well. It's a good situation, if the town is willing to be accommodating.
This is also why the local companies can do it better than a national company. It's a different situation when it's Bob down the street instead of AT&T.