20m discone

20 meters moxon antenna by SM5JAB - SM5JAB first experiment of a HF moxon antenna working on 14 mhz

Build your own 20m vertical  ^pop - Build your own 50ohm coax fed 20m vertical antenna, so easy a 9 year old can do it, or at least help! And the budget? You may already have the materials on hand, or worse case spend $15 by Andrew Daniel - KI4QFY

VK2ABQ Mini-Beam - A compact beam antenna that can be built At home, construction details for the 20M (14Mhz) version

40 meter delta loop - M0MCX - Pictures and details of a wire delta loop antenna for 40 meters band

40 meter shortened dipole - M0MCX - Interesting little project with a couple of loading coils by M0MCX

VE7CA portable tribander yagi - 30/17/12 and 20/15/10-Meter Tribanders and a 40 meters inverted V wire yagi antenna

CobWebb multiband folded dipole - It is basically a 5 band antenna comprising of 5 full half wave dipoles for each band - between 10M & 20M, the antenna is also resonant on 6M

20m QRP Dipole - Instructions to build a portable dipole for 20 meters

Buddipole by ZR6KMD - A rotateable dipole specifically for the 20m based on W3FF Buddipole design by ZR6KMD

Feeding an End-Fed Antenna  ^pop - End-Fed antennas are NOT balanced systems; but neither are verticals, ground planes, discones, windoms, zepps, Marconis, half-slopers, et al. Additionally, the low-impedance antenna port of your transmitter/receiver is not balanced.

J-Pole for 14MHz - 20 meter wire j-pole for 14.2 MHz, a vertical, end-fed half wave antenna by N1LO

HF Mobile Antenna HB9ABX - Most efficient hf mobile antenna, This mobile antenna is designed for all HF bands from 10 to 80 meters an proved to be very efficient in my travels in South America on 15 and 20m for contacts to Europe and within South America.

Dualband 17m/20m Moxon - A moxon rectangle for 17 and 20 meters band by N3OX

2-Element-DK7ZB-Quad for 5 Bands - 10-12-15-17-20m A description was in the German Ham-Magazine "Funkamateur" in Issue 11/2003

Vertical antenna for Vacation - Vertical Vacation Antenna for 80, 40 and 20 Meter-Band, by Herbert OE3BMB This antenna is a full size λ/4 for 20m and 40m band, and a shortened λ/4 for the 80m band. Generally on the 40m band the SWR is under 1,6. In 80m and 20m band at the resonant frequency the SWR is about 1,1.

ON3JT vertical multiband hf antenna - A simple and low cost multiband vertical hf antenna covering 5 bands (20m-10m) from an old CB antenna

Discone antennas - An article about discone antennas, installations and setup reports in french

A UHF Discone Antenna for scanners - Article on discone antennas by William K2MQJ and Rudolf KA2CWL

Parabolic Discone antenna - This is the highest gain omni design the world may ever know having wide bandwidth

G8ODE W3DZZ Antenna - W3DZZ multiband antenna for 80-40-20-15 and 10 meters band

Wire-Beam - Wire beam antenna for the bands 6m, 10m, 12m, 15m, 17m and 20m

WebSDR on 20m, 40m and 80m  ^pop - On this page you can listen to and control a short-wave receiver located at the amateur radio club ETGD at the University of Twente. In contrast to other web-controlled receivers, this receiver can be tuned by multiple users simultaneously, thanks to the use of Software-Defined Radio

A 20m monoband Power Amp - The 20m monoband 4-1000 amplifier, by Jelmer (pa5r), Herman (pa0ten) and Frans (pa5ca)

A low pass filter circuit - A simple 7 element, Chebyshev low pass filter, rolls of at 30MHz. Attenuation is better than -40dB at 60MHz, -65dB at 90MHz, -80dB at 120MHz.

Five by Twenty - A 5 tubes SSB QRP transceiver for 20m ham radio band