Inverted-L antenna

Related wiki pages Antenna, Propagation, Bands

Theory of Operation
End-fed longwire antennas that are 5, 7, 9, 11, 13 or 15 electrical quarter-waves long will exhibit a feedpoint impedance of between 150 ohms and 250ohms. Using a 4:1 balun at the feedpoint will enable us to feed these antennas with a 50 ohm source and cable (usually coaxial cable).

Because the amateur bands are related harmonically it is possible to produce an inverted L antenna that is resonant or almost resonant on a number of bands.

For example:
 * - a wire length of 128' (39m) will be resonant on 15m, 12m and 10m
 * - a wire length of 121' (37m) will be resonant on 30m, 20m and 17m

External links
 * VK1OD Inverted L for HF
 * An inverted L for small gardens
 * Inverted L for 160m
 * GM0ONX 6 band inverted L antenna
 * The ever popular Inverted L antenna