The present invention utilises one or more directional antennas. An example of a radiation pattern 400 created by three equally spaced directional antennas is shown in FIG. 4a (side view) and FIG. 4b (top view). Although separate directional antennas used together are discussed, it will be appreciated that a single antenna have multiple directional beams or lobes can also be used. The radiation pattern 400 comprises three separate patterns, each occupying an azimuth range centred on the azimuth heading value of the directional beams of each of the three directional antennas. Although the radiation pattern of each antenna is identical in FIGS. 4a and 4b, the patterns could be different. The radiation pattern for each separate antenna beam of the 3-beam directional external antenna systems should have at least 3 dBi gain.

FIG. 5 shows, schematically, the components of an antenna system 500 of the present invention. System 500 comprises a scanning antenna system 502 comprising three directional scanning antennas or a multidirectional antenna having three beams) which is connected to an RF network scanning analyser 504. Both the RF network scanning analyser 504 and the scanning antenna system 502 are in communication with a controller 506. Controller 506 is also in communication with donor antenna system 512 which comprises three directional donor antennas (or a multidirectional antenna having three beams). The donor antenna system 512 is in communication with a bi-directional amplifier 510 which in turn is connected to three internal antennas 508.