The range of radios is entirely dependant on where they are used and whether there are any obstructions like hills, buildings etc between the radios. All radios are capable of working over several miles providing there is good line of sight but the range will be reduced by any obstructions. Some manufacturers do quote approximate ranges of 2, 3 or even 5Km but these distances refer to ideal operating conditions and should be regarded as only a guide and cannot be guaranteed. Mobile and base station ranges increase to between 5 and 20 km depending on terrain. In order to increase these unit-to-unit ranges, users incorporate the use of a local repeater into their system.