[Boatanchors] antenna question

[Gerry Steffens]

An acquaintance who is also a boatanchor collector/SWL/BCB DXer (and messes
with longwave a little bit) asked me the following antenna question.  It has
been a while since I have sharpened up on antennas so I said I would ask the
wizards.

Wizards:

He recently moved from a plain old house to a quite new residence with metal
siding.  He reports that reception has gone in the tank compared to his old
place.  He has various radios scattered throughout the house and had
previously connected only a chunk of wire to most and received a good
quantity of signals.  He also uses several McKay/Dymek active loop antennas
(one per radio) on some of the BCB radios.  None of these work well in the
new place.  He uses a McKay/Dymek (Stoner) outdoor active antenna (DA100D)
at his bench.  The latter works very well.  The DA100D has an amplifier at
the outdoor antenna and another inside at the bench.  Output of the base
unit is RG58 cable to the receiver in use.

The local TV-DSL/internet provider has gone digital and recently came
through and replaced their old system box with a new one at the entry point
and ran CAT 5 cable from their new box to another "BOX" at each TV set and
computer, abandoning his 75 ohm analog distribution system which runs all
over the house.  The question: Is there a good way to connect the active
antenna output which uses RG58, 50 ohm output  to utilize the 75 ohm system
to get an antenna to his several radios and expect decent receiving
performance?

He came up with this as he was preparing to remove the old abandoned system.
He has decided that if he can't use the 75 ohm system, "Its gotta go!"
Frankly, he has more ambition than I as I would just let the old system
collect spider webs.

Gerry