|2 way radios seem to vary enormously in quality. Many are sold as little more than toys... If you can test out slightly better models you may find one which will do all you require?|
Televison crews, riggers construction crews, etc. often use 2-way radio systems; but they do use a professional style/spec'd model - as otherwise they'd be wasting money, and time - and possibly rising lives too. If crew members are a distance apart they need reliable comms. So perhaps look more professional kit?