NASA High HF Active Antenna for HF3/W & HF3/P | 4BoatsActive HF antenna designed for HF3 W and HF3 P SSB receivers; powered element for improved marine HF reception. Compatible with HF3 W and HF3 P SSB receivers Frequency range 230 MHz Impedance 50 Connector SO 239 (PL 259) Gain approx. 3 dBi Power handling up to 100 W PEP Supply 12 V DC, current draw ~50 mA Length 3. 0 m (9. 8 ft); stainless steel whip with base mounted preamplifier Supplied with mounting bracket and 5 m (16. 4 ft) coaxial lead;