Loop Aerial

[Murphyv310]

My Wellbrook is good, being a later high gain version, and I can listed to R4 for example day and night completely interference free.

thanks Gary

Hi Gary.
The only difference that should be noticed is the signal level between the old and re-designed Aerial. The signal to noise ratio will be virtually the same.
Where the old design fell down was when you were trying to resolve a weak station on a rather insensitive radio. A comms set or a decent set with say an RF stage or even an extra IF amp, there was never a problem, in fact the early loop has one distinct advantage of not getting overloaded with very strong local signals. I do know of one user that has this problem.
I really think the modification is the best compromise, it has better output to the original set up and still is good with strong signals. For all we know what's in the sealed box of Mr Wellbrook's loop could be similar if not the same as the the two transistor amp here.

Regarding your signal loss over a long length of coax, the effects of 50 or 75 ohm coax will be more noticeable at the terminating end of it, I think you do need to make a simple RF step up transformer.