Pure evoke swap aerial?

Have a hifi DAB with roof aerial and a portable which gets poor reception. Am looking at a Pure Evoke plus speaker which i would run off a 2nd roof aerial or amp the first. The evoke i have looked at does not have an ext aerial input. I can see that the telescopic aerial can be unscrewed. Does any one know if the thread is then the right size for me to screw an F type connector on and run to ext aerial? (I now see that Tivoli do a DAB. Tivoli's MW radios were very good).