Hi,

My doublet is fed with 300-ohm ladder line passing through a
3/4" wide, 10" long hole in the outside wall, which itself is
constructed of red house-brick. Is there any data available as to
how much loss I should expect from this considering that the SWR
will be quite high on most HF bands? A 'Google' search brings up
a lot of data on wireless LAN (GHz) losses but nothing that is of
much help to me.

The antenna is of indeterminate length (although longer than a
half-wave on 3.5MHz) and is matched at the transmitter by a
balanced line tuner.


73 de Joe, G3LLV