Balanced feed-line running along concrete roof tiles

[KG6SII]

I have about a 10ft section of 300Ohm twin-lead laying on my concrete roof tiles, from a vent to the center of my dipole.  Do I need to insulate the twin-lead from the concrete roof?

Thanks,
Glenn KG6SII

[W5DXP]

Do I need to insulate the twin-lead from the concrete roof?

A possible clue would be to measure the impedance (or SWR) under dry and wet conditions. Ordinary concrete absorbs water which could have a large effect on twinlead.

[W8JI]

I have about a 10ft section of 300Ohm twin-lead laying on my concrete roof tiles, from a vent to the center of my dipole.  Do I need to insulate the twin-lead from the concrete roof?

Thanks,
Glenn KG6SII

It is never a good idea to lay an unshielded  balanced line on anything. It should always be ***spaced *** several line widths away from other things, including roofs or dirt.

Insulation does not help, air spacing does.

[WB4SPT]

I don't think "dry" cement tile will affect your signal much.  But, I will say the tile will be abrasive and tear up your PE insulation.

[KA7NIQ]

I have about a 10ft section of 300Ohm twin-lead laying on my concrete roof tiles, from a vent to the center of my dipole.  Do I need to insulate the twin-lead from the concrete roof?

Thanks,
Glenn KG6SII

Well, I own a tile roof cleaning company here in the Tampa area www.saferoofcleaning.com and see moisture up there quite a lot.
The tiles on a roof can and do get wet, and retain water, from both the rain and humidity here in Florida.
I think the water might effect the twin lead, but you will have to measure to be sure.