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if they are actively using the connection yes, the only way to know for sure is to sniff the traffic and see something you are not doing. if they are passively listening, there is no way to detect it, period.
goddfather, i have to disagree fully.
the SSID is easy to sniff out of the air, you don't actually need the SSID to join the network anyways, just the channel and the MAC of the wireless router all of which is easily obtainable, this is in addition to the problems caused by several networks being on the same channel with the ssid 'linksys' causes.
Static ip's are just a bad idea, for several reasons, first, it is easy for someone else to assign them self a static ip and join the network, again by sniffing the traffic and getting the ip range information, second, you must manually set the DNS, and if your ISP changes the DNS on you, you have to set it again.
Reducing the power is just a crap shoot, you may make parts of your house unavalible, and others out side your house available.
if you want to secure your network, login to your router and configure it properly, change the default password, and apply encryption, WPA preferable, WEP if nothing else. don't forget mac filtering is worthless. use a complicated pass phrase, nothing simple.
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