Antenna Simulator
Cut it, hang it, and see what it actually does: the vertical lobe that sets your take-off angle, the horizontal lobe that says where it is pointing, and the dB you have towards the DX you care about. Height, ground quality, feedline and harmonic operation are all in the maths.
1 · Band and site
Everything below recomputes as you change these.
2 · Antenna
Sixteen models, all solved the same way.
3 · How you have put it up
4 · The two lobes
Vertical lobe elevation cut through the main direction
Horizontal lobe azimuth cut at the take-off angle
5 · The DX you are aiming at
Great-circle bearing, hop count and the angle the path needs — then what your antenna gives at exactly that angle and bearing.
6 · Height is the biggest lever
Radiated power against height and elevation angle, for this antenna on this ground.
Height map white line: take-off angle · orange: your target angle
Side view at this height
7 · Feeding it
Bandwidth, what the coax eats, and how much of your power actually leaves the wire.
SWR across the band
Feedline and losses what reaches the antenna
8 · Cut list
Start 2% long and trim to resonance.
9 · Every band at a glance
Same antenna, same height in wavelengths, every band.
10 · Questions people actually ask
Short answers, from the same maths this page runs on.
11 · Take it with you
Link, embed and API.
Share this exact antenna
The link carries every setting, so the page opens on what you are looking at now.
Embed it in a forum post
A drop-in iframe of this simulator, locked to your antenna, for club pages and forum signatures.
RoadmapCall the API
The same solver behind a JSON endpoint, so your logger or shack dashboard can ask for a take-off angle.
RoadmapAntenna Simulator Plus
PremiumGBP 10 / yearThe free simulator answers “how long, how high, which way”. Plus answers “will this path work tonight”, using live propagation instead of a textbook hop model.