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http://www.altair.org/natradio.htm

Exploring the electromagnetic spectrum.

Electronic Projects and Electronics Tutorials

http://my.integritynet.com.au/purdic/

An electronics tutorial radio design site. A page that covers nearly every conceivable subject of RF design and construction; with tips, hints and advice.

Harry's Homebrew

http://sm0vpo.8m.com/

Antennas, home brew radio circuits, and some theory.

How does a RF receiver work ?

http://www.4p8.com/eric.brasseur/receiv.html

How do radio receivers manage to communicate over huge distances? An explanation of the fundamental mechanism.

How Radio Works

http://www.howstuffworks.com/radio.htm

Informative multipart tutorial with illustrations and animations explains everything about radio waves, many related links.

Octaloop Antenna

http://www.lwca.org/library/articles/ywk/octoloop.htm

A gif schematic of a 8 sided antenna with mount details.

Receiving Loop Theory - N4YWK

http://www.lwca.org/library/articles/ywk/looptheo.htm

Sensitivity of multi turn receiving loops.