Those wifi cameras are limited to about 50 yards though. You could mod the antenna on it, but even then I doubt it would work out to 100 yardsThe more I think about, the more I like the remote camera idea. My little toy drone has a camera on it that you can connect directly to with your phone or tablet; no wifi network needed. You can get the camera by itself for $30: http://www.amazon.com/Blomiky-Camer...d=1449590720&sr=1-1&keywords=syma+wifi+camera
Get a large battery for it, set it up downrange close to the target, connect to it with your phone and no more squinting through cheap spotting scopes!