Base antennas — Sirio
Sirio GPA 27-45 tunable ground plane
1/4 wave ground plane antenna tunable 27–45 MHz, 1,000 W, height 4.73 m
The Sirio GPA 27-45 is an omnidirectional 1/4 wave ground plane antenna, tunable from 27 to 45 MHz following the supplied chart, rated 1,000 W.
Key features
27–45 MHz
Tunable from the chart.
1,000 W
Power rating.
Rugged
Withstands winds up to 150 km/h.
Specifications
| Type | 1/4 λ ground plane, omnidirectional, vertical |
| Frequency | 27–45 MHz (tunable) |
| Gain | 0 dBd / 2.14 dBi |
| Bandwidth | 2.5 MHz at 27 MHz (SWR 2:1) |
| SWR at resonance | ≤ 1.2:1 |
| Maximum power | 1,000 W |
| Impedance | 50 ohm |
| Connector | UHF female (SO-239) |
| Materials | Aluminium, chromed brass, nylon, stainless steel |
| Wind surface | 0.11 m² |
| Height | approx. 4,730 mm |
| Radials | approx. 2,680 mm |
| Weight | approx. 1,250 g |
| Mast | Ø 35–40 mm |
HamRadioShop | Base antennas
