Wifi AP mW and dBi impact on long range

Hardware Questions and Recommendations
1

While looking for a (future) supported OpenWRT Wifi AP I noticed a difference in the frequency specs and am wondering what the impact on range is.

There are devices with 2x the same entry for each frequency range, while others have 1x the entry but with double of the mW value.

Example on 2.4GHz:
NWA50AX (4 dBi): 1x 457mW
NWA210AX (6 dBi): 2x 249mW

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The same patterns also appears on the UniFi U6 Lite (3 dBi) and UniFi U6 Longrange (5.5 dBi)

Both are dual-band, so what's actually the difference? Which type would have the longer range and are there trade-offs?

Thanks

2

Future is correct - the NWA210AX is not supported.

Those are administrative entries where approval is sought based on different source data. I didn't go through all the attached documents, and I'm not going to, but I suspect for the NWA210AX they are showing that:

  1. The device's RF amplifier is of a specific power which complies with the rules and,
  2. The device's effective radiated power (which factors in beamforming and antenna gain) is within acceptable limits.

Range will be a combination of various factors:

  • Power output
  • Antenna gain, orientation, and pattern
  • Beamforming
  • Operating frequency

The NWA210AX will likely have the better range.