20m dipole

Capacitive Antennas - HB9MTN Capacitive antennas for 40m, 30m AND 20m

Broadband 80/160 Meter Dipole - An easy to build single wire antenna for 160 and 80 meters with a better than 2 to 1 swr across the 80 meter band by K5GP

W5VMs Shorty 40 Antenna - A shortened dipole for 40 meters band by Martin E. Meserve

Antenna Loading Coil Calculation  ^updated - The calculation refers to either a loaded 1/4 wave or a loaded dipole,

4:1 coax balun design - Online calculator for a 4 to 1 coax cable balun

Bent Dipole with gain - Bent dipole plan by G8MNY

The Cobra antenna - This article explores the Cobra Junior linear loaded antenna for 80m to 10m bands. This antenna is a linear loaded dipole described by W4JOH in 73 magazine June 1997

Folded dipole antenna by N4SPP - A quarter size cobra dipole antenna, a multiband dipole antenna for 40 to 10 meters basedn on original cobra dipole design but with a limited space by N4SPP

Center feed insulator - A center antenna insulator with feedline strain relief

Dipole Centre Insulator - GM3MCK Central dipole insulator for inverted V dipoles

Broadband Dipole 2MHz o 30MHz with no ATU - A broadband travelling wave dipole for HF bands, whose VSWR is less than 2:1 from 3 to 15 MHz and does not exceed 2.6 to 1 from 2.3 to at least 30 MHz

80-40-20 Meter Dipole antenna - Multiband dipoles capable of operating on 80 through 6 meters band with a tuner by KJ4EX

Constructing simple wire antennas - Simple wire antennas like dipoles and verticals are dead easy to make: here’s how

DL8NCR AllBand Dipole - A multiband wire dipole cover 80 to 10 meters.

OCF 2-Meter Sleeve Dipole Antenna - A 144 MHz dipole antenna made from coax, PVC pipe, and aluminum foil tape

Farapole homemade vertical antenna - The FARAPole, a portable vertical antenna for 6 through 20m by WA1GPO

Portable antenna comparison - Common antennas for portable use compared. A vertical antenna, a dipole antenna an inverted V and a fan dipole all at same height.

The Petlowany Principle - Spipral antenna principle by a concept of Bill Petlowany, K6NO. Tak Antennas are based on this principle, using spirals as dipole linear wires.

Dipoles versus Verticals - One of the classic arguments in amateur radio is whether a dipole or vertical is the best antenna

Antennas 101 - Dipoles, Doublets and Verticals by Rob May NV5E

QRP Antenna Tuner for 20 m - A small antenna tuner for 14 MHz

Vertical end Firen Antenna - A bi-directional vertical antenna with 4db gain over a dipole.

Windipoles - Windipoles is a free passive filter simulator. It is a Windows .NET executable, so no software installation is required. It enables design, analysis, optimizations and plots, all graphically.

QRP AM CW transmitter - A simple low-power broadcast-type circuit, using a crystal oscillator integrated circuit and an a collector modulated AM oscillator

QRP transmitter with VXO - This is a nice 1 W QRP transmitter that can be used in combination of one of the simple receivers.