of course i use a company called oxfordtecuk they do various aerials but the short one is no good as its got a chunky exposed aerial i brought the 10 inch one i think which is here
there is a six inch version, but i think i brought the ten as the cable is thin and wraps easily
tbh unless your heavy handed when removing the case there is very little risk and its relatively easy to change, if the unit goes bang for any reason ill switch it back and hope lol
but as always its done at your own risk lol