[Physics] Antenna/Swinging mesh

Why don’t you just try a physics constraint first and see how you like it?
There’s plenty if tute videos if you search youtube.

A personal motto of mine is to avoid physics setups when at all possible because you loose control to someone elses system and they are usually difficult to get to do and feel exactly as you want to. But then they might also be the best solution if you really want that realistic physics behaviour. Especially if you don’t want to/can re-code the behaviour yourself.