When designing for high-density environments such as stadiums, which is MOST important?

Omnidirectional antennas radiate equally in all directions, causing excessive co-channel interference and wasting RF energy in areas with no clients - the opposite of what high-density design requires.

Increasing transmit power raises the noise floor for neighboring APs on the same channel, worsening co-channel interference and degrading overall capacity rather than improving it.

In high-density venues like stadiums, the challenge is capacity and interference rather than coverage. Directional antennas focus RF energy toward seated client areas rather than wasting it in empty space, and sectorization divides coverage zones so each AP sector serves a smaller group of clients with higher available airtime. This reduces co-channel interference between APs and allows aggressive channel reuse, which is the foundation of high-density WLAN design.

Deploying APs only on 2.4 GHz limits the design to three non-overlapping channels in most regions, creating severe co-channel interference and severely restricting aggregate network capacity.