That is up to how you have the device configured and has nothing to do with the antenna.
To answer your question in plain English though, on all motherboards with built in WIFI you can have it act as a router with the correct supporting software, unless you are using some REALLY old hardware that has a chipset that doesn't support the features necessary to do this. (No recent ASUS products fall under this issue.)
MB: ASUS Rampage IV Black Edition
CPU: Intel Xeon E5-2697 v2 (Cooled by Corsair H100i w/ Noctua NF-F12 fans)
RAM: 64GB G.SKILL RipjawsZ 1600 (10-10-10-30)
GPU: EVGA GeForce GTX Titan X Hybrid
TV Tuners: 2 * Hauppauge HVR-1800
Case: CoolerMaster Cosmos 2