This is not a big topic but let me share.
Over here in Japan, spaces are quite limited and many parking slots have limited heights (usually 1550mm).
In fact, I use 'mechanical parking facility' in my apartment: cars are parked in 3 stories (underground, ground and upper story).
Hence, I am supposed to park cars under 1550mm.
As you know, Cooper and MCS have lower 1430mm height but
default antenna is longer and you need to take it off whenever you park.
To cope with this height constraint, I purchased a 'short antenna' at BOND MINI tune shop. This has only 50mm height and I believe I can park anywhere going forward
The below is BOND MINI URL but unfortunately we don't have English pages.