I do not think you can change the SSID of the THETA V when you have it in AP mode (it works like a hotspot).
People have tried to extend the range using antennas from a fixed point to another fixed point, not from a drone.
The WLAN frequency and channel can be adjusted. You can adjust the frequency with the mobile app. 2.4GHz might give you a bit more distance.
See this:
The primary differences between the two frequencies are the range (coverage) and bandwidth (speed) that the bands provide. The 2.4 GHz band provides coverage at a longer range but transmits data at slower speeds. The 5 GHz band provides less coverage but transmits data at faster speeds.