
On April 7, strong signals could be received on many US channels in Salzburg, even distant stations such as KCJJ, Iowa City, on 1630 kHz could be heard well on my Beverage antenna.

Guenter Fred Mandel, DL4ZAO, has written a mini-whip compendium that is well worth reading. Anyone operating this small and inexpensive antenna should definitely take a look at it. https://dl4zao.de/papers-en/index.html