Four meters is rather a unique band as it is primarily used by the UK.
The band became available to UK amateurs in November 1956 and started life
with a mere 200KHz bandwidth. Today it extends from 70.025 to 70.5MHz.
countries that currently have 70MHz allocations are Denmark, Ireland, Greenland,
Portugal, Croatia and South Africa.
The fact that the band is not widespread, with no allocation in Japan or
America, means that with the exception of the recently
reintroduced AKD-4001 4m FM Mobile Transceiver, there is
very little commercially available equipment. Therefore
home brew equipment is required. Transverters are a popular method to get
going on the band using existing HF or 2 metre transceivers.
If you are someone who likes the challenge in building your own
equipment then this band could be of interest to you. To find out more,
visit the 4 metre website.