Topband: Where to ground the Beverage feedline?

[Tom W8JI]

> Um -- what did you say was the typical skin depth of soil at 2 MHz? 
> Somehow,  I seriously doubt it was down that far. :)

Common mode suppression requirements depend on things:

1.) The sensitivity of the antenna to all signals, either bad unwanted 
signals like noise or good wanted signals. This is the good signal and bad 
noise power output of the antenna.

2.)  The level of unwanted signals and noise fed down the feeder towards the 
antenna.

3.) The ratio of series and shunt impedances along the system, but only 
**if** the system has enough unwanted CM junk to overcome antenna signal 
power.

For some reason beyond my understanding, I think we are going far over the 
top of what is reasonable....and it is getting worse.

I was at a friend's house and he told me about installing very long bead 
strings in Yagi antenna feeders. Please, let's all stop this needless bead 
insanity and get back to some common sense.

Any conductor very near earth for a long distance has considerable 
attenuation along the conductor. If it didn't, we could bury our NVIS 
antennas or run longwires laid right on dirt with high efficiency. It's all 
about ratios everywhere in the system, including the CM injected and signal 
level sensitivity of the antenna.

I make enough measurements of antennas here every year, some right in my 
driveway near noise sources, to know when something is getting overblown.

73 Tom