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