Fixed Radio Link Siting Requirements

Fixed radio links operate at frequencies which require direct line of site, with range diminishing as frequency increases. The radio links must be free from obstruction, such as hills, buildings, trees or large moving objects. These factors, together with the need to take account of the curvature of the earth and differing atmospheric conditions, affect the siting and height requirements of antennas. To cover long distances, or to circumvent obstacles, intermediate repeater radio stations are often necessary. They require at least two antennas, one to receive and the other to relay the signal; other antennas may be required for additional capacity or for fall-back use.