EA3AIL station · Catalonia

Everything you need to put up an antenna and get on the air

HF antenna calculators that draw what you design, a forum to talk it over with other hams, and a weekly newsletter on what the bands are doing.

Quick calculator

Frequency (MHz)

Wavelength—

Half-wave dipole—

Each leg—

Quarter-wave vertical—

Dipoles, verticals, EFHWs, loops, Yagis and coil-loaded antennas. Move a slider and the drawing, radiation pattern and efficiency update instantly.

100 MHz to 1.3 GHz: DL6WU Yagi, J-pole, Slim Jim, collinears, quad, helix and discone, with SWR, patterns and link and stacking tools.

A vintage-style radio that really works: control towers, HF and VHF receivers around the world, Morse code and scanners.

Sign up with your callsign and ask questions, show off your builds, or tell us about that DX contact that took you three nights.

One short email a week: propagation, an antenna worth trying and what's coming up.

Coax loss, SWR, power conversion, Maidenhead grid squares and the distance between stations.

HF bands

Pick a band to open the calculator with the frequency already set.

160 m · 77.99 m 80 m · 39.42 m 60 m · 26.86 m 40 m · 20.27 m 30 m · 14.21 m 20 m · 10.15 m 17 m · 7.94 m 15 m · 6.78 m 12 m · 5.77 m 10 m · 5.05 m 6 m · 2.87 m

Forum

Mast for a decentrated dipole

by lluis EA3AIL · October 26, 2026

3Replies

Inverted V-dipole or off-center dipole

by Emili EA3CYZ · October 16, 2026

2Replies

RF output power

by lluis EA3AIL · October 16, 2026

3Replies

As a gift

by lluis EA3AIL · October 16, 2026

1Replies

Very good tool

by lluis EA3AIL · October 13, 2026

1Replies

10 threads · 26 posts · 16 members