Inverted L Antenna For 80 Meters

Antenna construction centers around a loaded wide spaced high q coil that feeds into 50 ohm coax in combination with 300 ohm transmission line end sections. The wire is exactly 66ft long. How to build an inverted l for the low bands 40m 80m and 160m an inverted l is just like a vertical apart from the fact that instead of going straight up like a tuned quarter wave it turns 90 degrees somewhere.

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Inverted l antenna for 80 meters.

The center fed inverted l has the potential to be a quite satisfactory all band wire antenna suited to certain environments. Planning a dual band inverted l for 160 80 meters modeling a quarter wave inverted l antenna for the low bands. 160 meters and 80 meters. Below about 90 overall wire length the antenna becomes essentially a 40 meter and up inverted l.

84 mini horse yagi antenna. 80 inverted delta loop antenna for 160m. This wire is an inverted l with about 25feet hanging vertical and the rest horizontal. 82 300ohm ribbon dual band dipole.

86 fan dipole antenna for 80m to 6m. An inverted l antenna is basically a wire antenna typically to wavelength long on the band it is designed for. The inverted l antenna and nvis. In the fall of 2007 i was able to install my first amateur radio tower while this certainly was a huge improvement over my humble butternut multiband vertical my new tower had a major shortcoming a lack of antennas for the low bands.

Shorter antennas down to about 90 overall wire length can be built and used on 80 meters. The elevation at 40 feet is a small fraction of an optimal 130 foot half wavelength height so the signal is mostly reflected upward in an oblong shape. On 80 meters the l shape reduces the signal strength almost half to 3 39 dbi as compared with 6 06 dbi when straight. Of course you must keep the end of the antenna high enough above ground such that humans and animals will not be harmed by the high voltage on the end of the wire.

So if i assume the popular dipole formula 468 f mhz is correct then on 80 meters and applied also to a quarterwave then i would see resonance at f mhz 468 66 2 3545mhz. The inverted l antenna is a common antenna for the 160 meter and 80 meter amateur bands where typical wave verticals are impractically tall for most amateurs. For a compromised antenna system it performed as well as my 80 meter inverted vee. Shown here is an inverted l with its long leg sloping to the ground.

Shortened inverted l antennas are 65 of the overall length of the full length inverted l providing the same high performance in a reduced size. 81 inverted l for 160m. Although the radial system is far from ideal the inverted l has been able to gather both local and dx contacts on 80 40 20 15 and 10 meters. If you can find a tree house pole anything elevated which can be used to support the end that will work better than when sloping to the ground.

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