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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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).