The Spectrum Compact HF Active Antenna is a 420mm PVC cylinder with right angle mounting bracket and 7 metres of high quality RG58 cable terminated with a Belling Lee (TV) connector.  There is an o-ring seal between the PVC tube and the L-bracket and the coax cable entry is through a waterproof gland.

It works in conjunction with a DC/HF combiner (sometimes referred to as a bias-T) that has a BNC socket for connection to the receiver and a DC 2.1mm chassis plug for connection to an external 12/13.5V supply.  It comes with an 0.6m red/black DC cable and also a 0.6m BNC to BNC connector to the receiver.

The Spectrum Compact HFAA is a modification of the original sold by Garex Electronics and as standard only gave a gain of 20dB at low frequency falling off rapidly to 0dB at 28MHz.   A modification to the internal circuitry now achieves a gain of 21dB at 680kHz and 28MHz rising to 24dB in the middle of the shortwave band.

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