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Is it possible to build an UnUn for VHF or UHF like in HF? Goal is to use a simple endfed wire or piece of metal as an antenna.

EDIT: I meant "endfed halfwave".

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  • $\begingroup$ Yes, but not with HF components. $\endgroup$
    – user10489
    Mar 10, 2023 at 23:08
  • $\begingroup$ Ok, this is obvious, but what are those "non HF" components? Another ferrite ring, or other copper wires? $\endgroup$
    – microfox
    Mar 12, 2023 at 20:46

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Yes.

The matching section of a j-pole is an example of an impedance match device between coax and a monopole antenna. The contacts can be moved up or down the match to accommodate a wide range of impedance.

Depending on your design requirements, you may consider an L configuration dipole or a bazooka configuration dipole (sometimes called a flower pot antenna or dipole because it's also easy to conceal).

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  • $\begingroup$ This? hamradio.me/interests/j-pole $\endgroup$
    – microfox
    Mar 12, 2023 at 20:52
  • $\begingroup$ Not quite an unun -- in fact, the j-pole needs a choke balun. But it is the 2m end fed half wave version of the HF end fed zepp.. $\endgroup$
    – user10489
    Mar 13, 2023 at 0:52
  • $\begingroup$ I dunno, I'd be comfortable calling it an unun since it transforms impedances between two unbalanced systems. It does need an RF choke for sure... I think you typo'd with "choke balun"? $\endgroup$
    – webmarc
    Mar 14, 2023 at 2:04

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