• http://www.babbage.demon.co.uk/morseabc.html
• http://www.arrl.org/arrlvec/2002_Extra_Pool3.txt
• http://www.ac6v.com/antprojects.htm#40M
• http://www.vcnet.com/KN6LA/6m.html
• http://www.hamstation.com/ysupicvx5.htm
• http://www.sfarc.org
• http://www.arrl.org/FandES/field/regulations/USbands.gif