If your trying to get a antenna for your T-Mobile Home internet device try looking here where someone was able to use one and shows how to set it up..This is for the Newer T-mobile deice that is made by Nokia which are the 5G units
https://www.reddit.com/r/tmobileisp/comments/l93wym/how_to_use_an_external_antenna_on_the_tmobile/
Post yours if you get it working please