Other 2.4GHz ISM Properties
Band is 2.4GHz to 2.48GHz
Allows speeds up to 2Mbps, 11Mbps short range
Distance depends on the antenna and its gain, up to 8km
Band allows up to 14 channels (11 in US)
To not overlap, they must be 25MHz or more apart
With very short distances some obstacles are ok, e.g. walls within a building