Joseph Oberlander wrote:

Their marketing is rubbish, btw. Any standard "whip" type
antenna will work like that - just shorten it to the exact
frequency that you desire and aim it around until you get a
good signal.


A lower frequency requires a *shorter* antenna?? I thought it would
have to be *longer*. Please explain.

Sorry - I got it reversed. but the theory is the same - find
the right length and make it so. Then aim.

Sorry, but I am having trouble figuring out how to extend a whip
antenna to a length longer than its maximum. Hints?