OK, a quick lesson ....
CB. Citizens Band. Operates on the 27 Mhz band. Max power 4 watts. Originally using Frequency Modulation (FM), Amplitude Modulation (AM) and Single SideBand (SSB) were not allowed. I'm pretty sure that these modes of operation are now allowed, but output power is still limited in an attempt to reduce interference with other services. 27 Mhz CB is now licence free. There are a small number of 49 Mhz CB sets about but it never really caught on.
VHF. Very High Frequency. There are no licence free services on any VHF band. The equipment offered for sale on eBay, particularly the VHF/UHF sets are primarily Amateur Radio service; 2 metres and 70 centimetres and as such a licence is required to operate this type of equipment.
UHF. Ultra High Frequency. Similar restrictions apply to UHF as those of VHF, however there is one exception, PMR446 which allows licence free services on specific frequencies. Once again, the output power is restricted to 4 watts to reduce the chance of interference and to reduce the range.
VHS is nothing to do with radio it's no to do with old fashioned video tape recorders!