How critical is it to mount twinlead feedline (300 ohm TV ribbon type) so that it doesn't come into contact with anything? Obviously, with bare ladder-line type feeders it's absolutely essential (to prevent shorting!), but what about the insulated type of 300 ohm twinlead --- can you have it run next to wood, say, or even metal as long as there is no conduction between the inner conductors and anything metal that might cut through the insulation? I've heard that Home Depot has a newer type of 300 ohm twinlead that is oval, almost circular in cross section because it is foam filled and thus if it were to be lying on top of something, or next to something, there would be an extra 'cushion' between the current carrying wires inside and anything outside the wires so would that mean it would be OK to run this type feedline up against the wall of a house? Or would it also be absolutely essential to somehow mount it so that it is free and clear of anything?
73 from Canada
VA7FAB