Nighthawk M1

Hi, I have a nighthawk M1 and I wanted to boost my signal, so I bought a lte wifi antenna and I bought bingfu external pigtail TS9 to use in the external antenna ports on my M1, when I plug them in, I notice I loose connectivity and the bars for my signal go down to 1 bar on the M1, am I missing something or is this normal, did not think I would lose connection when plugging in the pigtail to the M1. Any help would be greatly appreciated, thank you.