wrote in message
oups.com...
Is there any advantage or disadvantage to running my antenna cables
(mostly RG-8 and some RG-58 and Twinax for loops) in metallic
electrical conduit, probably 1/2" EMT?

The shack is in the basement and various antennas come in through the
roof/attic, three stories up. Currently the antenna cables drop down a
fairly clear hole shared with some vent pipes and Ethernet (CAT-5) and
phone wires.


There are no RF disadvantages of running the coax in a metallic conduit.
YOu may get some shielding and also some lightning protection if the conduit
is grounded, but it is doubtful it would really be noticed if good quality
cable is used. YOu just can not run unshielded twin lead or ballanced line
in the conduit.