Topband: Strange resistance between Beverage ground rods

[Herbert Schoenbohm]

I have reflection transformers at the end of every two wire Beverages 
which I try to test by measuring the wires on the feed end. I remove the 
transformer from the two wire WD1-A and check the resistance between the 
two wires which tells me that through the reflection transformer I have 
continuity. It measures about 40 ohms wire to wire, this is done when I 
notice any performance change of the antenna. Now come the next test 
that baffles me completely.  When I measure from either wire to my 
ground rods alone, to see what the return resistance is, I get reading 
in the vicinity of 20K  across the 900 foot run.    I understand that if 
the reading was very low it would defeat the whole Beverage principle.  
But is 20K Ohms reasonable, very good, or marginal?  I use three foot 
foot rods at either end and when I pull one out yesterday before moving 
it the bottom 1/4 was moist and muddy. That Southern end of several 
reversible Beverages  is located about 100 feet or less from a salt 
marsh or salt pond.  I also have to such antennas made up of ladder line 
a DX Engineering components.  They all appear to be working well even 
though large grass has reach and covered portion of some of them.

But my question is what is a reasonable or good return ground resistance 
for a 600' or 900' Beverage.  I haven't found any sources of information 
expect the saying that the higher Resistance the better. Is this correct?

Herb Schoenbohm, KV4FZ