This is designed to take the 5.8 Ghz camera with integrated antenna such as the ones made by Eachine (TX02 AIO FPV VTX Camera ). Mine is mounted on an RC car (Tamiya Dark Impact) but it would also suit drones or RC planes as it is very light and somewhat aerodynamic.
The mounting holes are for M3 and are spaced at 35mm x 16mm. There is also a 10mm slots for velcro or cable tie mounting, The bottom is flat so hoop and loop tape could also be used.
The cameras can be purchased on Aliexpress quite cheaply.
Credits:
Pascals