What is Antennas & transmit power?
External high-gain antennas vs internal.
Short answer
More antennas isn't automatically better; band support matters more.
Antennas & transmit power when buying a wi-fi router
External high-gain antennas vs internal.
Why it matters: External antennas you can angle usually work better across floors.
Look for: More antennas isn't automatically better; band support matters more.
Full Wi-Fi Router buying guide