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I just checked out an end-fed antenna for portable low-power HF ham radio. It has no counterpoise, the instructions don't even talk about a counterpoise, and the designer warns that if you use a "ground grid" you may detune the antenna!

I looked at another brand, and it's the same. That one is sold by DX Engineering.

Electrically, there _must_ be a counterpoise. What is it with these antennas? It's the shield of your feed-line, your radio, everything connected to your radio, and you. ...