Hi guys, I place my router downstairs in a corner whereas my PC is at the other end of the house upstairs. I have phobia of using cheap WiFI adapters such as Belkin 54G and Aztech so I decided to get a Level One Hi Gain adapter which work beautifully, giving me rock solid stable connection with 4/5 bars of signal. LevelOne Global - WUA-0624 150Mbps Wireless USB Adapter (4dBi) Now I have another PC upstairs I am thinking of getting another WiFi adapter, between these 2 choices 1) Hi Power 5dbi 150mbps Welcome to TP-LINK 2) Hi Gain 3dbi 300mbps adapter Welcome to TP-LINK I would love to get the 300mbps but I am held back for 2 reasons 1) To use 300mbps, it requires channel bonding, means it runs on 40mhz mode - no big deal, router supports it, but I heard that we can use 40mhz only if there is no other devices around as 40mhz frequency sorts of book a substantial part of the 2.4ghz spectrum. FYI, I have my brother connected to the same network next door. How do I know if there is sufficient channel to run on 40mhz? What I understand is there is 11 channel on 2.4ghz, so on 40mhz mode, how many adjacent channels do I need that is unoccupied? 2) It has 3dbi antenna, if the signal is weak enough, the speed will drop and it may be worst than the hi gain 150mbps adapter. I need high speed as I stream movies from my media center downstairs which is connected via LAN to the router. I do not want a HomePlug adapter as my router ports are full. With the existing 150mbps adapter, it is a little jerky at times. What do you guys reckon.