Agree with previous mention of listening out when within the ATZ. By mentioning "uncontrolled" if only A/G or AFIS is provided, within the UK the DOC (designated operating coverage) for the frequency will be 3000 FT/10 NM, so this should be the maximums for operation on the frequency, both outbound and inbound. Use outside these parameters may cause interference to another UK aerodrome using the same frequency and end up with you being on the wrong end of an MOR.