WiFi channels in Hong Kong

802.11b / 802.11g
3 non overlapping channels in HK
2.4-2.4835 GHz

802.11a
12 non overlapping channels in HK
5.15-5.25 (4); 5.25-5.35 (4); 5.75-5.85 (4-5)

Worldwide Regulatory Progress
ITU World Radio Conference (WRC-03)
Agenda Item 1.5: set a global allocation: 5.15-5.35; 5.47-5.725
Total 455Mhz
Plus existing 5.75-5.85 > 580Mhz; i.e. 24 non-overlapping channel in 5GHz