Kenneth Scharf ,WA2MZE wrote :

The only window in my shack faces the front of the house. The window is
a a special hurricane resistant shatter proof glass. Also the window is
25 feet behind the location of the operating position in the shack room.
Access to the window is not possible, and the XYL won't hear about
feedline visible in the front of the house. I have a 2" plastic conduit
running from the operating position to the attic crawl space that
currently has on run of RG/8U for my vertical, with room for one or two
more runs. Running the twinlead next to the coax would probably not be a
good idea.
---------------------
Living in a bungalow ,hence having a ground floor shack ,I run DC cables
, 2 coax lines and twin feeder (450 Ohms ,the wide variety) all in the
same plastic duct (about 2 metres long) to the loft from where coax is
fed to an outside 2m beam and and a discone antenna (the latter used
for local 2m FM operations) and the twin feeder to a doublet (all fed
through a double cement block wall)
The 12 V DC cables run from solar charged batteries located on the loft.

With all those cables running through the same 2 metres long plastic
duct I don't experience any problems with RF operations with the twin
feeder.

BTW the plastic duct is a piece of square 65 x 65 mm gutter drain pipe
,widely used here in the UK.

Frank GM0CSZ / KN6WH