4.4G 4400Mhz drone video data transmitter and receiver

The below model supports a 4.4G transmission frequency, 4400Mhz for drone video data transmitter and receiver. The unit cost at USD3950.

The air unit uses two omnidirectional fiberglass antennas.
To support longer transmission distances, the ground end needs to use a directional antenna and an omnidirectional antenna.

We also have a model that supports a 5.7 GHz working frequency.

Additionally, our Vcan1988 supports 200Mhz~6000Mhz (up to 6Ghz) working frequency customized.

What frequency do you think can improve the survival space of drones in complex electromagnetic environments?