For 5.8GHz FPV systems, there are 5 main bands divided into 8 channels each. That gives 40 channels free to use. So, in theory, 40 pilots should be able to fly FPV at the same time. Unfortunately, this is not true.

First of all, there are transmitters, and there are transmitters. Better, properly tuned, will broadcast in narrow frequency range. Cheaper, or just not properly tuned, will broadcast on much wider frequency range. The same goes for receivers. They can listen “only” to their frequency, but also to others. The result is, that a transmitter can pollute other channels. This is why, general rule is then 2 pilots should not fly on adjacent channels. If pilot A is using CH1, pilot B should use CH3 and so on.

Below is a comprehensive table showing the most common 5.8 GHz FPV frequency channels for analog systems. The table includes the well-known Bands A, B, E, F, and R.

A Few Points to Note

• Standard Use:
  Bands A, B, E, F, and R are most commonly used by analog FPV systems.
• Interference & Region:
  Always verify that the frequencies you choose are legal and free from interference in your area, as local regulations and crowded spectrum environments (like WiFi channels) might impact performance.
• Default band:
  When in doubt, always use band R as it offers best channel separation and in theory lowest interference between them. 8 pilots sill will not be able to fly together, but 4 will fit without problems.

Not only frequency separation between bands B and F is smaller than expected, there might me overlaps, channel 4 is crowded and band E jumps high and low. Nightmare that concludes: you should not fly CH4 on bands A and F. Also better not to use CH4 in band B. Just to be on safe side. On the other hand, band E (FR3) is not overlapping with other bands. Also band A is quite safe as long as you are not using CH4.