Does your 3050 not have an antenna connection on the back of the system? Also I assume you had to connect the antenna to the adapter when you installed it? As an alternative have you thought about an external antenna such as this one from Amazon? You can connect it directly to the M.2  WiFi adapter and feed the wires out of the case to the antenna (I have done something similar in the past).
Hello all. I have just installed an M.2 wifi/bluetooth card (Dell MHK36) in a refurbished MFF Optiplex 3050 but the signal for both is so poor to be almost useless, which I'm putting down to it not coming with any antenna. I would like to install some internal antennas but for the life of me cannot find which ones to purchase (or where to, either). Any help would be much appreciated. Many thanks in advance!
Internal wifi/BT antenna for Optiplex 3050 MFF?