In the UK, it seems that apart from the "halo" type omnidirectional antenna
(ie folded dipole bent into a circle) there are no other commercial
omnidirectional offerings. I mean marketed for the listener. So, it looks
like one has to homebrew an FM antenna.

Does anyone know of any online plans for an already mechanically engineered
FM/VHF omnidiectional antenna? Could be turnstile, slim jim, j-pole, ground
plane, co-linear, or whatever. Or, any designes published in magazines.

TIA.