Does anyone know if leaving the WIFI on affects the battery

Like the subject says, If I leave Wi-Fi enabled all the time, will the battery drain quicker because it is constantly looking for a wifi signal or always connected to the wifi in my house?
IPhone   Mac OS X (10.4.10)  

Wi-Fi drains the battery since it is always looking for Wi-Fi networks if it not connected to one already. Not to mention that Wi-Fi uses more power as well.
When the iPhone is in your pocket waiting for a phone call, it is basically in stand-by mode. That's why when you "wake" it up by pressing the Sleep/Wake button or the Home button, you're still connected to the Wi-Fi access point or EDGE.

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