Do replacement antennas make a difference?

[mountainmachine]

Tried switching channels but hasnt helped, i still get decent speeds etc, just low connection strength, what do the channels mean? Are any higher power etc?

[Agent]

Different channels are just what frequency the signal is sent on.
Some routers like the WRT series can be hacked to up the transmit power.

10 tips for improving your wireless network is a good read.
And Wifi Signal Strainer (WokFi) Long Distance - The World's Biggest Show & Tell - tech, diy if you want to get handy