[TowerTalk] UL listed protector for ladder line

[Paul Christensen]

>"That does put a manually operated device somewhere..."

Like this one:

https://tune-a-tenna.com/

Advantage: allows a 1/2 wave azimuth pattern on all bands or even variable patterns if desired by adjusting antenna element length.  It also solves the problem of achieving low SWR across the entire 80m-75m band without the need for a tuner.

Disadvantage: price and unknown mechanical reliability, particularly in snow/ice.  An external tuner may be required if the internal radio tuner is out of range when operated as a non-resonant antenna to obtain a lobe direction advantage.  In that case, there's coaxial mismatch loss.  

But it could also be used in place of the W7FG type of dipole-doublet with an open feeder line instead of coax to get the lobe advantage with low line loss.  Then match somewhere along the line or change line length (e.g., W5DXP solution) in binary selected distances (i.e., 1 ft, 2 ft, 4 ft. 8 ft... up to 32 ft).  

https://drive.google.com/file/d/1DhLv_1rk3lBD4C70bPeC-iobbfNe2B3Z/view?usp=sharing

It is yet another option to consider with its own set of compromises. 

Paul, W9AC