@brainflex.
The aerial on a PMR446 radio is fixed and cannot, or should not be removed.
All PMR radios are made to the common specification, but spending more money, Icom, Motorola, Kenwood gets you a much better quality build, better audio, better battery pack, removable battery, spare battery, drop in intelligent charger, repairable etc, etc.
If you want more oomph, power, you need to get an Ofcom licence and buy a business radio and correctly programme the radio to the licence terms and conditions.
Unfortunately, there are too many people about abusing the airwaves, bit like too many people with ‘tuned’ ebikes or throttle controlled e bikes, which in reality are electric motorbikes.