LOCATION, LOCATION, LOCATION
Location of the router to be more specific. As I have mentioned before, a Wi-Fi router as configured by the manufacturer usually has a range of 150 feet indoors and 300 feet outdoors. There are more powerful routers and antennas that have a longer range as in this case. This router has a range of about 500 feet. When an antenna is set in front of a window, that full outside range can be realized. If a strong router is placed in the porch or directly in front of a window, the signal would reach all the condos with an unobstructed view with an "Excellent" to "Very Good" signal, while the signal to the owner's own living room might be only "Good", because going through the outer CBS wall, and the two interior walls might have removed 40% of the signal traveling from the porch to the living room. The map below is shows the Royal Oak Clubhouse area. See how many people are seeing this routers signal.
Multiple Router's on channel 6
The picture below shows 3 Wi-Fi routers located so they broadcast a strong signal to the outdoors. The 802.11 standard says that Wi-Fi equipment is supposed to minimize interference by waiting to transmit until there is clear air, in actuality there is no link between the 3 routers, so two will often try to talk at once. If that happens when your router is sending a message or your PC is acknowledging receipt, the router keeps repeating the message until the acknowledgement is received. If all this traffic was on a single router there would be a barely noticeable change in speed. In actuality the speed will be severely degraded due to the interference from all the Wi-Fi routers. In the gazebo area near the pool, there were 9 strong Wi-Fi router signals on channel 6 during mid-day high season. It is no wonder that the connection is so slow, if you can hold a connection at all at this time of day.
While a Wi-Fi Hotspot at the club house should be broadcasting to the common area around the pool, the private users should be confining their signals to the immediate area of their condo. This is done by centrally locating the router and reducing the transmitting power.