Mosley TA-33
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| Frequency | 20, 15 and 10 m (3-element tri-band Yagi) |
| Bands | 20m, 15m, 10m |
| Power | Rated about 1500-2000 W (up to 2.5 kW on the high-power version). A passive antenna - no power is consumed. |
| Modes | n/a (3-element tri-band HF Yagi beam) |
| Weight | 16.7 kg (36.8 lb) - About 16.7 kg; 14-foot boom, ~28-foot longest element, ~5.0 m turning radius. |
| feedpoint | SO-239 (50 ohm), at the driven element |
| power req | Passive directional antenna. Requires a tower/mast and a rotator to aim it; trap-loaded for tri-band operation on one feedline. |
A proven, durable tri-band Yagi that delivers real directional gain and front-to-back on 20/15/10 m from a single feedline - the rotatable beam that transforms DX and contest performance over wire antennas. Mosley's trap construction is robust and high-power-capable, and the TA-33 is a long-standing benchmark.
It needs a tower or sturdy mast and a rotator, it is a substantial mechanical structure to assemble and maintain, and the traps add some loss/narrow bandwidth versus monoband Yagis. It covers only 20/15/10 m (no WARC or low bands).
The Mosley TA-33 is a classic high-power 3-element tri-band Yagi for 20/15/10 m - solid gain and front-to-back from one feedline, on a manageable 14-foot boom. It is a benchmark tri-bander; the smaller TA-33-Jr trades some performance for size, and the Classic-series and 6-band PRO models sit around it.
The Mosley TA-33 is one of the classic tri-band Yagi beam antennas, a three-element directional array for 20, 15 and 10 meters built around Mosley's long-running 'Trap Master' design. A single coaxial feedline covers all three bands, thanks to trap-loaded elements - a director at one end, a reflector at the other and the driven radiator in the middle.
As a beam it delivers what wire antennas cannot: real forward gain and front-to-back rejection that you can aim with a rotator. Mosley rates it at roughly 8.3 dBd on 10 meters, 7.3 on 15 and 6.5 on 20 (factory figures, which run optimistic), with about 20 dB of front-to-back on all three bands, and it handles serious power - around 1500 to 2000 watts, with a high-power version rated to about 2.5 kilowatts. Mechanically it rides on a 14-foot boom with roughly 28-foot elements, weighs about 16.7 kilograms, and needs a turning radius of about 5 meters.
The requirements are those of any beam: a tower or strong mast, a rotator to point it, and the effort of assembling and maintaining a real mechanical structure; the traps also add a little loss and narrow the bandwidth compared with monoband Yagis, and it covers only 20/15/10 meters. For the leap in DX and contest performance a rotatable tri-bander brings, though, it is a benchmark.
It is the full-size sibling of the Mosley TA-33-Jr and a relative of the Mosley Classic 33.