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Whip antenna
A whip antenna can work well, and is not directional.
Three element antenna
For best reception use a three-element antenna. This can add up to
10dBµV to the received signal strength, and mounting the antenna
higher, such as in a loft, can add a further 10dBµV. A three-element
antenna is highly directional and so should be oriented for best
results.
AM reception
For best results use a large loop of wire, six feet across or more.
This will pick up strong signals with a minimum of interference. The
loop antenna is directional and it should be mounted vertically,
facing the stations you want to receive. Keep it away from
computers, televisions, and mains wiring to minimise interference.