From 1963 until its demolition in November 1993, the mast was used as part of a directional aerial for a mediumwave transmitter.
12.
A directional aerial array was used to avoid wasting power over the English Channel and to enhance the signal to the east and west.
13.
It is also possible to realize directional aerials for mediumwave with cage aerials where some parts of the cage are fed with a certain phase difference.
14.
Cellular wireless networks generally have good capacity, due to their use of directional aerials, and their ability to reuse radio channels in non-adjacent cells.
15.
It used a directional aerial consisting of four 125.1 metre ( 407 feet ) high guyed steeltube framework masts insulated against ground with triangular cross section.
16.
Initially broadcasting on 837 kHz, 3CR now broadcasts on 855 kHz at 2 kW into a directional aerial, from a site at Hoppers Crossing about 15 km west of Melbourne.
17.
The directional aerial for 648 kHz ( erected in 1981-82 ) consisted of a row of five 106.7 metre ( 350 ft ) freestanding steel lattice skywave propagation.
18.
It worked simply with a crossed pair of conventional and fixed directional aerials, the oscilloscope display showing the relative received strength from each aerial as an elongated ellipse showing the line relative to the ship.
19.
This type of radiation was not possible with the aerial on the wood framework tower and a directional aerial consisting of two insulated guyed radio masts with a height of 94 metres had to be built.
20.
In its time on the AM band, the station had its power increased twice, first to 2, 000 watts, and then to 5, 000 watts, using a directional aerial system.
