Mobile Signal Longleat

Hi everyone, I have secured a seasonal pitch at Longleat and having stayed there several times before have never been able to get a mobile signal and have relied on site WiFi (which can be poor). I stay at the top of the site and next year will be first time the caravan will be there all season. I intend to do some work whilst there and would appreciate anyones experience with such things like Maxview Roam to get a mobile data signal.

many thanks