UK Radio Astronomy Association (UKRAA)

UKRAA is pleased to announce that a new assembled version of the E-field Probe Active Antenna Amplifier Kit is available for purchase.

Two current versions of this kit are available to purchase from our online shop:

An SMD component kit comprising the PCB and all SMD components.

An assembled module with the SMD components mounted and tested.

We have introduced a new version of this product. This is a fully assembled version with the RF and power connectors mounted on the PCB is also available for purchase priced at £28.50.  Please email This email address is being protected from spambots. You need JavaScript enabled to view it. for full details and to order this product.

Members of the RSGB may have seen our announcement of this product in the December edition of Radcom which was sent to members in November. Unfortunately, this announcement went out prior to the update of our online shop. Please e-mail for full details.

The Invisible Universe


UKRAA is proud to announce the E-Field probe active antenna amplifier and Bias-T as designed by Dave Powis G4HUP and originally sold under the HupRF brand.

The Invisible Universe

This kit won the Construction category at the Radio Society of Great Britain Construction Competition 2016.

The user needs to connect a short whip or plate to the amplifier and enclose the assembly in a weather proof enclosure ready for installation.

The completed antenna is a compact alternative to traditional HF antenna designs.

The amplifier has a good response from below 20kHz to over 30MHz and is ideal for monitoring both wanted signals and HF band interference.  For the radio astronomer it covers the VLF band and would provide a means of monitoring interference.

The amplifier and Bias-T is available either pre-built or in kit form and is simple to build and install and provides a good quality active HF antenna suitable for use with SDR receivers.

It is also an ideal project to learn and improve your ability to solder Surface Mount Device (SMD) components. This kit is suitable for Clubs to use as a training aid for soldering skills and gives course participants a useful new piece of kit after the course.

The pre-built amplifier and Bias-T can be purchased here from our online store

While the kit form can be purchased here from our online store

Customer Testimonial from G0API (urban location)

Fabulous bit of kit – most value for money Amateur Radio item for many years.

I have logged over 300 LF NDBs, 56 DGPS beacons and quite a lot of HF traffic up to 18MHz. One evening I had 3 decodes from VK6XT at 14,872km distance on 3.5MHz WSPR and decodes from K3RWR and AA3GZ on 1.8MHz.

Also I have used the kit as a means of teaching hand soldering of surface mounted components.

I certainly recommend the product.

We have added to our bookshop the third edition of Dr Gerrit Verschuur's excellent book on the history and future of radio astronomy: 'The Invisible Universe - The Story of Radio Astronomy'.

The Invisible Universe

Buy from our online store

The UK Radio Astronomy Association (UKRAA) is pleased to announce its appointment as a distributor of LabJack’s U3-HV multifunction data acquisition module.

LabJack U3-HV


This LabJack module is recognised by Radio-Sky Pipe II, the strip chart recorder and data logging software published by Jim Sky, which is widely used by amateur radio astronomers. To order the LabJack U3-HV and for more detailed information buy from our online store, or contact us at This email address is being protected from spambots. You need JavaScript enabled to view it..


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