Waldemar Święch, SP7GXP, is a Polish antenna designer with over 40 years of experience in designing and manufacturing directional antennas. yagi antén. V roku 2026 jeho dielňa uviedla dve nové anténne konštrukcie: compact 2-element five-band yagi s trapmi a 9-prvkový tribander for the 20, 15 and 10 m bands. Both are designed for the operating conditions of Central Europe - that is, for stations where mechanical resistance is as important as RF parameters.
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SP7GXP 2-element yagi for five bands (2026)
The first innovation is a 2-element five-band beam antenna with traps, which covers the 20, 17, 15, 12 and 10 m bands. The band change is ensured automatically by the trap design itself without the need for a switch. Power is supplied by a single 50-ohm coaxial cable. The antenna has been included in the production program since March 2026.
| Parameters | Value |
|---|---|
| Bands | 20 / 17 / 15 / 12 / 10 meters |
| Active elements per band | 2 / 2 / 2 / 2 / 2 |
| Gain (dBd) | 4.5 / 4.7 / 5.4 / 5.2 / 5.5 |
| F/B (dB) | 15 / 15 / 15 / 20 / 15 |
| Bandwidth at VSWR 1.5:1 – 20 m | 350 kHz |
| Bandwidth at VSWR 1.5:1 – 17 m | 100 kHz |
| Bandwidth at VSWR 1.5:1 – 15 m | 350 kHz |
| Bandwidth at VSWR 1.5:1 – 12 m | 100 kHz |
| Bandwidth at VSWR 1.5:1 – 10 m | 600 kHz |
| Max. SSB power | 2,000 watts |
| Max. výkon DIGIMODES | 1,000 watts |
| Boom length | 2.4m |
| Max. element length | 9.79m |
| Turning radius | 5 meters |
| Wind resistance | 135 km/h |
| Front surface | 0.72 m² |
| Min. height above ground (open space) | 5.5m |
| Weight | 17.5 kg |
For a five-band antenna with a 2.4 m boom and a 5 m swing radius, this is a very compact solution. The gain on 10 m reaches 5.5 dBd, which corresponds to a solid 2-element beam design. The bandwidth of 100 kHz on the 17 and 12 m bands is understandable at their frequency and sufficient for most operating situations.
SP7GXP 9-element tribander for 20, 15 and 10 m bands (2026)
The second new feature from May 2026 is a 9-element beam for three bands – 20, 15 and 10 m. The antenna has 3 active elements for each band. The power supply is also solved by a single 50-ohm coaxial, the band change is automatic.
| Parameters | Value |
|---|---|
| Bands | 20 / 15 / 10m |
| Active elements per band | 3 / 3 / 3 |
| Gain (dBd) | 5.35 / 6.35 / 6.05 |
| Gain (dBi) | 12.5 / 13.5 / 13.2 |
| Max. F/B (dB) | 30 |
| Bandwidth at VSWR 1.5:1 – 20 m | 350 kHz |
| Bandwidth at VSWR 1.5:1 – 15 m | 450 kHz |
| Bandwidth at VSWR 1.5:1 – 10 m | 1,700 kHz |
| Max. SSB power | 5,000 watts |
| Max CW power | 3,000 watts |
| Max. výkon DIGIMODES | 1,500 watts |
| Boom length | 5.45m |
| Max. element length | 11.2m |
| Turning radius | 6.01m |
| Wind resistance | 135 km/h |
| Front surface | 0.8 m² |
| Min. height above ground (open space) | 10 meters |
| Weight | 32 kg |
Gain of 6.35 dBd on 15 m and F/B up to 30 dB are attractive parameters for both contest and DX operations. Bandwidth of 1,700 kHz with VSWR of 1.5:1 on 10 m covers practically the entire amateur band without tuning.
Why GXP antennas?
The production of GXP antennas is based on several design principles that the author consistently applies in all models. The material of the elements and the boom is aluminum alloy AL6065-T6 - the same as that used in the aviation industry. The technology of narrowing the diameter of aluminum tubes allows a smooth change in diameter along the element, which reduces the overall weight and increases the flexibility of the elements in gusts of wind.
The coils are machine-wound, which guarantees repeatability of the parameters of the inductive elements. The insulator inside the coil is made of UV-resistant glass fibers. The current baluns are wound with Teflon coaxial cable on high-quality cores - standard for 2 kW power, optionally up to 4 kW. The balun and support masts for the anchor ropes are included in the delivery at no extra charge - which most manufacturers do not include.
The boom of small antennas is made of a tube with an outer diameter of 60 mm and a wall thickness of 2 mm, for larger antennas it is 70 mm with a wall thickness of 2.5 mm. The elements are attached to the boom with aluminum plates and saddle clamps together with U-bolts made of high-strength stainless steel. The design allows the antenna to be mounted on the side of a truss mast with dimensions up to 80 cm.
Video: GXP Beam 4-band antenna in operation
The following video from the SP7GXP channel shows the test operation of the GXP 4-band beam antenna:
Availability and price
Prices for individual GXP antenna models are not published directly on the manufacturer's website - interested parties can obtain them upon direct request via the contact form at sp7gxp.plGXP antennas are available directly from the manufacturer in Poland; the delivery includes a balun, support masts and mounting accessories according to the customer's specific requirements.
The five-band 2-element beam with a 2.4 m boom is a suitable choice for a station with limited space that wants to have a directional beam on all major HF bands from a single coax. The 9-element tribander with a gain exceeding 13 dBi and F/B of 30 dB is the solution for contest and DX operations where every dB counts.