Wifi – Aruba Wireless Controller 200 and AP70 manual

Those access points on channel 2 are probably interfering with both channel 1 and channel 6. Not bad work. You could try and move your access points to channel 11 and see if you get less interference, or have a word with your neighbours and tell them to use a more sensible channel for their access points. alt text http://jpoa.info/blog/wp-content/uploads/2008/09/80211-frequency-channel-map.jpg

you may even be able to move your access points to channel 14 (in some countries).

You need to avoid overlap. There are other sources of interference too, such as microwave oven's, street lighting, fluorescent strip lighting in offices.

you ap's should be on different channels, depending on their spacing.

Again, it maybe just the make and model of your client cards, not all wireless cards are created equally.

best to check your ap logs and see why disconnections are taking place.

http://wifi-doc.com/Cisco.Press-802.11.Wireless.Ne/1587051648/ch03lev1sec3.html

has some nice information and channel placement.

http://www.wifiyacht.net/wifi-adjacent-myth.html

The Right Answer^(tm) is that It Depends^(tm).

Generally, dual radio APs have higher client capacities than single radio APs, but roughly the same coverage area. Conversely, however, single radio APs can be distributed in a wider area, allowing each AP to use a lower transmit power and spread the client load across multiple APs. It's a tradeoff. More clients in a tigher space generally means that you need more radios.

If you're going to have areas of high client concentration you will typically need fewer dual-radio APs in those areas than you'd need single-radio APs.

Whether your clients are 802.11b/g/a/n makes a different, too, because a network with predominantly 5.4Ghz clients will be able to pack more densely with fewer APs simply because there are more non-overlapping channels and the APs don't have to function as "spotlights".