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Cross Country Wireless HF Active Antenna

CCW HF Active Antenna The HF Active Antenna was developed as part of the development work for the Sentinel HF SDR noise measurement receiver and program.

There was a need for an antenna that could be used for accurate RF measurements over a wide range of HF frequencies without being affected by coupling to nearby metallic objects or RF noise from common mode coupling on the feeder and would give long term repeatable results.
If it was an active antenna it also had to be capable of surviving high RF field strengths from HF transmitters operating on the same site and be tolerant of mounting position and supply voltage.
It also had to be built from the highest quality materials to work unattended for years in all weather from arctic to tropical conditions.
It also had to be sensitive enough to receive and measure the RF noise floor at the quietest sites without being overloaded by the strongest broadcast signals in the HF bands.

Now that the RSGB noise measurement project has ended we have redesigned the amplifier used in the antenna to extend coverage down to 10 kHz. Early versions were limited to 200kHz.

This is the result...

Features include:

HF Active Antenna with 20m cable (US/international shipping)
HF Active Antenna with 20m cable (UK/EU shipping)

The PayPal button automatically adds 20% VAT if the buyer is in the UK or EU.

The HF Active Antenna Operating Manual can be downloaded here .

YouTube video of early prototype HF Active Antenna

CCW Active Antenna base unit

The green LED is Power, the red LED is Antenna connected.

Covert installation of CCW Active Antenna

A quick covert installation in a tree. Almost invisible!

Close up of CCW Active Antenna

Close up of "temporary" installation.

Contact Chris Moulding, G4HYG via

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