I believe the signal is the maximum power rating allowed by regulations. 60 meters is a long distance. You may not get good results. Please be aware that the distance will also be negatively impacted by WiFi interference with other signals.
Can you connect the THETA V to a Raspberry Pi and then use a directional WiFi antenna connected to the Raspberry Pi?
See this thread for connecting the THETA V to a Raspberry Pi with a USB cable.
Please share more information on your application. Maybe we can contribute additional ideas.
You could also try a WiFi range extender.
If it were me, I would try to use a WiFi directional antenna attached to a Raspberry Pi.
I have not tested any of these products. I just found them on Amazon and looked at the user ratings.
This USB adapter lists support for Raspbian. I have not tested it.