to calculate the
length of a half-wave dipole antenna:
L = total length of dipole in feet; and
f = frequency in MHz.
Dipoles can be combined for multiple bands. Illustrated above is a simple multiband dipole antenna for 80 and 40 meter operation KC6WDK used with great success. The 40 meter section also permitted use on 15 meters. The sections were separated by 2' at the far ends of the 40 meter elements. The antenna was made from scrap lengths of insulated wire with the ends twisted together. The 50-ohm RG-58 coax lead-in was coiled at the feed point to form an optional broadband choke balun which prevents antenna currents from flowing back into the transmission line. Despite the scrounge-and-improvise construction and although only 12 feet off the ground, this antenna performed very well.