This article describes the construction of a 20 meter J-Pole ham radio antenna. K6AER used a fifty-foot TV push up mast, schedule 40 PVC insulators for standoffs, 12 gauge wire for the matching section and a wooden post.

This antenna is fed for vertical polarisation, to give a low angle of radiation for DX and also a nearly omni-directional radiation pattern (broadside is the best direction by about 3 dB).

Attic Coaxial-Cable Trap Dipole for 10, 15, 20, 30, 40, and 80 Meters NU3E A coaxial-cable trap dipole antenna installed in the attic provides a surprisingly effective solution to HF operation on the 10, 15, 20, 30, 40, and 80 meter amateur bands at a QTH with restrictive covenants that prohibit outside antennas.

QST article - 4 band vertical, 25' for 80m, 40m, 15m, and 10m bands.

ROTARY DIPOLE FOR 17 AND 20

Magnetic Loop Antenna for 20m, 30m, 40m by G4FON

Petlowany Three-Band Burner Antenna
The Petlowany Three-Band Burner is a simple, low-cost, trapless short vertical antenna which amazingly works on three HF bands (20, 15 and 10 meters). This web page contains pictures, performance data, and enough construction details so you can "homebrew" your own.

Portable HF Transmitting Loop Antenna - 10m - 20m

Spiderbeam - lightweight antenna for 10-20 The spider beam is a full size lightweight tribander yagi for 20/15/10m, made from fiberglass and wire. It has been specially developed as a highly efficient antenna for dx-pedition and portable use.

Construction tips for a 3 element mini beam made using Hamsticks