short 40 m

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Short DL6WU yagi for 23cm - 1260 MHz yagi antenna for ATV with a total Bandwidth (3 dB) 1240-1280 MHz and 10 dBd gain
[ Hits: 138 | Votes: 1 | Rating: 4 ]

SAFARI 40-30m vertical Antenna - Roach pole vertical antenna for 40 and 30 meters band featuring good performance on short skips contacts compared to wire dipole
[ Hits: 310 | Votes: 0 | Rating: 0 ]

A shortened 40 meter rotary dipole - The antenna build into this project is made from 2 fishing poles on a fiberglass pole in the center.
[ Hits: 1215 | Votes: 4 | Rating: 4.75 ]
40m Linear-Loaded Dipole - A short dipole wire antenna for 40 meters band. It is a folded dipole that do not make use of coils and can be used either in horizontal or inverted V configuration
[ Hits: 1507 | Votes: 3 | Rating: 8.67 ]
40m loaded dipole - This is an short dipole for 7 MHz. Total length of this dipole is just 10 meters, 33 feet. Missing lenght is balanced by a coil made of 49 turns of a 40mm diameter pvc pipe. The use of a choke balun is recommended, as always, to adapt the unbalanced coax cable to the balanced antenna, and to prevent RF feed back along the coax shield.
[ Hits: 194 | Votes: 4 | Rating: 8.75 ]
Half-Length Dipoles for 40 Meters - Complete collection of the four main parts of this excellet research on modelling and designing half wave dipole antennas for 40 meters band, covering all aspects beginning from full wave length antennas, to shortened, loaded and reshaped dipoles
[ Hits: 382 | Votes: 2 | Rating: 10 ]

Shortened 40 meter Vertical for POTA SOTA - Build A Shortened 40 Meter Vertical antenna For POTA / SOTA Activations. A project for a portable wire antenna for 40 meters band suitable for POTA or SOTA operations.
[ Hits: 125 | Votes: 1 | Rating: 10 ]

Shortened 80m Antenna - An antenna for 80 meters band for those who does not have enough space to setup a halwave wire dipole that is aprox 130ft or 40 meters. The antenna is an open-wire-fed shortened dipole
[ Hits: 421 | Votes: 1 | Rating: 1 ]

20 / 40 Meter Short Coil Loaded Dipole Antenna - Experimenting a 20 40 meter short coil loaded dipole antenna with the goal to keep the total length under 40 feet so that the dipole can be mounted on two 20 foot fiberglass pole to make a 20/40 meter rotatable dipole.
[ Hits: 350 | Votes: 3 | Rating: 8.67 ]

Shortened EFHW Antenna 80-10m ^updated - A shortened multiband antenna, about 23m long, for 80m - 10m bands with a low SWR (<1.3) on 80m and 40m, and <3 till 10m. Bandwith on 80m is 300kHz
[ Hits: 4133 | Votes: 11 | Rating: 6.18 ]
End-Fed Half-Wave Antenna for 20m 40m 80m - How to Design and Build a Field Expedient End-Fed Half-Wave Antenna for 20m, 40m and 80m. This Shorty 80m EFHW comprises a 49:1 autotransformer (to match the very high impedance at the end of a half-wave wire), a half-wavelength wire for 40m (also a quarter-wavelength for 80m), a loading coil and a short tail wire. The coil and the short tail wire (about 6 feet) make up the other quarter wave on 80m.
[ Hits: 141 | Votes: 1 | Rating: 4 ]

Reversible 40 Meter Moxon ^updated - The author wants a compact, switchable antenna for 40-meter ham radio. They compare 3 designs: rectangle, short-tipped W6NL, and T-hat. All work well electrically, but mechanics matter for a large antenna. The rectangle needs strong support, while the T-hat is sturdier with slightly longer elements. The T-hat design wins for now, but the author will focus on its mechanical details next.
[ Hits: 74 | Votes: 2 | Rating: 5.5 ]

Short Antenna for 40-30-20 Meters Band - This page describes an entirely simple, One-Knob matchbox that will match this antenna efficiently on 40, 30 and 20m, using a simple circuit that can be switched between series-resonant and parallel-resonant with just one banana jumper
[ Hits: 237 | Votes: 1 | Rating: 7 ]

Portable Vertical Antenna - A home made portable vertical antenna, that with a single 1/4 wave counterpoise wire is possible to achieve less than 1.5:1 SWR on 40, 30, and 20 meter bands. It is basically a center load, shortened ground plain vertical antenna.
[ Hits: 362 | Votes: 0 | Rating: 0 ]

Modified Ground Plane Antenna Adds Second Band - This article explains the trick of how to shorten and lengthen pairs of radials to make a 2-band ground plane antenna. Included is a "Table of Multi-Band Possibilities" covering the range of 6 to 40 meters.
[ Hits: 53 | Votes: 0 | Rating: 0 ]

Some Useful ZS6BKW Modifications - The ZS6BKW antenna evolved from an optimization of the G5RV antenna. The SWR on 80m is too high and the 40 ft ladder line matching section is a little too long on 17m and a little too short on 10m
[ Hits: 1025 | Votes: 3 | Rating: 4 ]