It all depends on the terrain and operating environment. For instance in open country a low power radio will give coverage of up to 5 km whereas in a built up area the same radio might only offer 100 to 200 metres range due to the signal being ‘absorbed’ by buildings. A similar situation exists with ‘in building’ environments, i.e hotels and banks where a higher power radio (licenced digital as an example) would be appropriate.
Under some circumstance a ‘repeater’ to rebroadcast the signal and/or multiple antennae may be required. CTS will look at your specific requirements and advise you accordingly.