[X4U] Wireless and ethernet

[Michel Treisman]

Just wondering.  I have a Netgear adsl modem-router.  I can connect  
to it with an ethernet cable or wirelessly. If my laptop is on the  
table next to the router, I can do both.  Is there any advantage (or  
disadvantage) to using Airport+ethernet cable, rather than just  
ethernet cable?
Wireless communications are more noisy than  cable, so when I  add  
Airport to the ethernet, am I lowering overall fidelity?
(Does that make sense?)

Mike