Thank you for your reply.
We use small IP rated cabinets with routers inside an the modem placed on the outside. This is a mobile system and is moved around by our customers. Given the size, specially the mg41e, it happens very often that they break the antennas. I would like to place the modem inside the cabinet for protection, but then I have to use a extention cable to reduce the lenght of the modem by placing the antennas somewere else in the cabinet.