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Cross Country Wireless High Z Antenna Amplifier

High Z antenna amplifier

The High Z Antenna Amplifier is designed to match shortened high impedance antenna elements to a 50 or 75 ohm feeder for excellent reception in the medium wave, 160 and 80m amateur radio bands with good reception from 100 kHz to 30 MHz.

In typical use the main antenna element is a 3 to 6m (10 to 20 ft) vertical rod or wire. The ground connection is a single earth or ground rod.

In normal times we would just supply the amplifier as a single item. With a worldwide coronavirus lockdown we realise that it's difficult to source ground rods and alloy poles to build an antenna so we are supplying it with a 5m wire for an antenna and a 10m wire to be laid on the ground to make a loop counterpoise.

The voltage gain is set to unity and the amplifier offers repeatable gain and phase performance so that any number of amplifiers from 2 to 9 can be used in a directional phased array with a suitable phase switching unit.

The amplifier is housed in a polycarbonate box with stainless steel antenna connections and a BNC or F type socket. 12V DC power is fed up the feeder to power the amplifier. It can also be powered with 4.7V DC from the bias-tee in SDRPlay receivers.

Like our other active antenna products it has RF overload protection to allow it to be used very close to transmit antennas without damaging the amplifier or the attached receiver. It also has an optional diode limiter on the output to protect delicate wideband SDR receivers like the SDRPlay receiver from damage. A wire link can be cut inside the amplifier to allow it to run at full output for use with high performance receivers.

High Z antenna amplifier diode limiter jumper

The amplifier has a common mode filter on the RF output to stop noise and interference picked up on the coax feeder from entering the amplifier.


High Z antenna amplifier with US/international shipping

Bias tee

High Z antenna amplifier with UK/EU shipping

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

We can also supply a 5 to 15V Bias Tee based on our Loop Antenna Amplifier base unit PCB

There is no additional amplifier and the DC input from the 2.1 mm DC socket is filtered before being coupled to the antenna socket.

It also has reverse polarity protection to protect the antenna amplifiers coupled to it.

The maximum DC current through the bias tee is 1A so it can be used to supply power to up to 10 High Z Antenna Amplifiers or 10 Loop Antenna Amplifiers in a phased array as long as there is a DC circuit through the phasing coax and switching arrangements.

Bias Tee PCB with US/international shipping

Bias Tee PCB with UK/EU shipping

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

We can also supply a RF quiet 12V 2A power supply to power the bias tee PCB and amplifiers.

Here's a video of the Loop Antenna Amplifier. It's just here as a space saver for the video for the High Z Antenna Amplifier that will be added in a few days.

Contact Chris Moulding via

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