How about a switch? Simple and easy to find. It is likely though that a very
long antenna will overload that radio. Might be just as well off with the
discone. General rule of thumb. If you want a scanner, buy a scanner. If you
want a shortwave radio, buy a shortwave radio.
"Birderman" wrote in message
...
HI,

I have a yupi MVT7100 which I connected a attic based Discone. The Discone
is a radio shack 25-1300Mhz model a few years old. I find this setup
quite
acceptable especially for Airband monitoring, however, I wish to use the
shortwave reception of the Yupi, for this I intend to use a long wire
antenna mounted outside. To do this can I just join the two antenna feeds
together and connect or do I need a diplexer ?

If a diplexer is required has anybody got a URL where I can download a
circuit diagram of one for homebrew....

I have an ATU which has inputs for 50ohm coax, Longwire and balanced pair,
could this be used as a Diplexer as well ? or will it only function with a
single antenna connected ?

I look forward to any help on this issue
regards
Birderman