Hi Phil
You could look at www.wellbrook.uk.com who have two
products that will do what you want, one passive and
one active.
I've attached brief product details below,
73s Tracey G5VU
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Wellbrook Antenna Combiner/Splitter ACS 5030
The Wellbrook combiner/splitter allows the combining
of two antennas with the output split to two receivers
The ACS 5030 is a passive transformer Combiner/Splitter
that has a frequency range from 50kHz to 30MHz.
A special feature of the ACS 5030 is a phase inverter
that can be switched to allow the antennas to combine in
either phase or anti-phase to provide optimum performance.
The ACS 5030 can also be used as a single antenna Combiner/
Splitter thereby allowing two receivers to be fed by one
antenna or two antennas to feed one receiver.
The ACS 5030 is built into a small ABS box 25 x 50 x 70mm
and is supplied with 4 BNC sockets.
Wellbrook 4 Port Splitter / Amplifier AS 1030
The Receiving Antenna Splitter allows for up to four receivers
to be fed from a single antenna with no loss in signal.
The Wellbrook AS 1030 Splitter is a passive transformer Splitter
that has a frequency range from 100kHz to 30MHz and is fed by a
12dB gain broadband amplifier.
This amplifier and Splitter combination provides an overall gain
of 6dB from 100kHz to 30MHz.
The Splitter has a single antenna input with four outputs to allow
up to four receivers to used with up to 25dB isolation between the
receivers.
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