If you saw a UHF/VHF Combo antenna, it will have two dipoles that are extendable and a circular ring in between. those extendable dipoles are for VHF reception and the ring is UHF. that means such an antenna is a combo UHF/VHF antenna. on recent sets, the circular ring is now replaced with a plastic square that swivels.
A VHF-only antenna is basically your 'rabbit ears' or two extendable poles only, no ring and used to ship with new TVs in the late 80s-90s. some TVs of that era also sport a slot for such an antenna.
A UHF-only antenna is not so common but is usually a ring only, some people even 'create' a UHF only antenna by removing the two extendable poles and leave the ring, and then combine it with a set of VHF-only rabbit ears with an antenna 'combiner' since for some, having them set on one unit causes interference, so they 'separate' them and put the two newly-seperate antennas in different locations so they can get better reception, such as adjusting the VHF side independently without affecting already good reception on the UHF side.
Roof-mounted antennas are almost always combo UHF/VHF since their dawn of existance.
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