Alf Watt, former Apple Wi-Fi engineer and creator of the fantastic Wi-Fi utility, iStumbler, joined us on this week's Mac Geek Gab 509 to talk all things Wi-Fi. The episode contains a bunch of juicy Wi-Fi tips and I highly recommend you give it a listen, but for now our four favorite tips are listed below. Think of this as the MGG 509 Cliff's Notes... and make sure you read, erm, listen to the whole thing, too. On to the tips:
1. Use same SSID for all radios on the same network (be they 2.4GHz or 5GHz). If you have one network in your home but have either multiple routers/access points for better coverage or multiple radios in one access point, the advice is the same: use the same SSID (wireless network name) for all of them and let the client devices each decide which is best to use.
Apple devices choose networks by your preferred order. Period. If you have multiple networks of different names your Mac or iPhone will always choose the first in your iCloud-synced "Preferred Networks" list even if this one isn't going to give you the best bandwidth. If you have the network name/SSID the same then it will chose the radio that it predicts will give the best throughput (which isn't always the one with the best signal, but that's an even geekier discussion you can hear in the show). Make all the Wi-Fi networks in your home the same. Your life will be better for it.
2. Deal with congestion with more access points using less power. In response to a listener's query about how best to deal with having lots of access points in a small location, say an apartment building, the best thing to do is to actually increase the number of access points but lower the transmit power on each so as to keep them from interfering with each other. It's good if your neighbors do this, too, of course, but it will help even if it's just you. We recommend using Powerline adapters to connect all of your access points together to avoid the headaches of just extending Wi-Fi.
Another helpful option is to use 5Ghz channels where possible. The higher frequency band doesn't go through walls as well and may be exactly what the Wi-Fi doctor ordered in highly-congested areas (and when we get 60Ghz Wi-Fi, that'll be even more helpful!)
Next: When to use Wide channels and Antenna Orientation.