@Bradly2015 

Hi,

Without knowing the actual model number and hardware version of your 4G LTE router it is impossible to give a definite answer.

On most of TP-Link's 4G routers the detachable antennas are the 4G LTE antennas, for example the Archer MR600 V3 whose specifications can be read here: https://www.tp-link.com/en/home-networking/3g-4g-router/archer-mr600/v3/#specifications

Specifications for other models you could check by yourself.