I had always assumed these were all the same size but the connection to my Avtex TV is very loose in the socket. TV has been back to Avtex who report that it’s all ok. So reverted to bag of aerial bits in garage. Most connections were loose in the socket, one was a bit tighter and two were too big! Can you get adapters to tighten the fit or do Avtex sell their own? Currently get round problem by wedging aerial between TV and wall to stop movement in socket. Thoughts appreciated.