I have established a wireless link between two houses for about two years already. The wireless link is between a WRT54G router and a WAP54G access point. But the strange situation is that about every few months, the link will go bad, such that if I ping from one side to the other side, I can only get less than 5% ping success. I tried power down/up either side and no used. But when I use 'site survey' from the access point to view the router power level, it still seems as good as normal. The only way to re-establish connection is by changing wireless channel. It seems that they need to 're-sync' the channels every few months.