How to use 40 feet long extension cable with Webcam?

Hi,

I am looking for your help,

I have Microsoft Lifecam VX-5500 (WebCam)

I want to adjust this cam on my roof. The distance of my computer to roof is approximately 40 feet.

I have 40 feet long USB extension cable but it doesn't work because of USB power supply problem.
( I also know the usb support 16.5Feet long extension cable)
Can anybody help me out that how can i connect with my Cam which is fixed in my roof?

I wanna use this cam as a security cam.

Is that your actual cable or just a picture you found?

You need a repeater with an active cable to travel that length without any losses.

derekimo said:

Is that your actual cable or just a picture you found?

You need a repeater with an active cable to travel that length without any losses.

thanks for your reply.
Yes i took this picture from Google images.

can you tell me name of repeater? or picture? etc

basicly you need maybe 4 indivuidula 10feet cables with a repeater in between each one

Seriously...you're going to mount that to the outside of your roof....you know it's not weather proof in any way.

he could build a clear plastic/ glass box around it