[Elecraft] Feeding with 300 OHM Twin Lead in basement ceiling

[Don Wilhelm]

Norm,

Keep the feedline away from conductors by 3 times the line spacing - 
more if you can.  You may be able to find TV standoffs for 300 ohm line.

An end fed Zepp antenna will work nicely if it is 1/2 wave long and the 
feedline is 1/4 wave (or any odd multiple).  If those conditions are not 
true, it is not a classic zepp antenna. 

Look at the popular J-pole antennas, they are nothing but a classic zepp 
antenna oriented vertically (the J part is the 1/4 wave transmission 
line - high impedance at the open end, and a low impedance at the 1/4 
wave point - so the bottom can be shorted with the 50 ohm point up a bit 
from the short)

73,
Don W3FPR

Norm Klieman wrote:
> I am thinking of feeding an end fed zepp using 300
> twin lead for mh K1. My shack is in my basement. How
> careful do I need to be with the twin lead around
> ceiling conduits, pipes and air vents? Is there a good
> rule of thumb for how many inches I need to stay away
> from these items or am I just overthinking here??
> Thank for the feedback!  73's -- Norm  K9NK
>
>