A good simple explanation of home made antennas can be obtained from RST
Engineering in sunny California ! They publish a booklet on the subject for a
few dollars. In addition you will need some copper tape and a bag of toroids,
also a six inch bolt if you intend to make a xponder aerial. Suggest though
you get the bits in the UK (if British) as customs duty on a paperback and a
roll of copper tape proved to be extortionate and it took four weeks to
arrive (Air Mail !).
RST's web page is http://www.rst-engr.com/
The web page is worth a visit if only to sample their wacky sense of humour !
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