The increase in power comes from using higher gain antennae, the actual radiated power of the wireless router is limited to a level set by ETSI About ETSIthis is to avoid co channel interference although increasing the antennae gain will increase the output power if done correctly it should not cause problems to other wireless networks located nearby
If the router has multiple antennae then setting these up in a space diverse configuration can improve a wireless network to great effect with little increase in antenna gain other than to overcome the cable losses, this creates an effect similar to having multiple wireless routers in the same network without the configuration issues
If the router has multiple antennae then setting these up in a space diverse configuration can improve a wireless network to great effect with little increase in antenna gain other than to overcome the cable losses, this creates an effect similar to having multiple wireless routers in the same network without the configuration issues