Is this normal for a wifi signal(top green line)? Or should it be somewhat straight with a few dips / rises like the others? (Does it even matter what it looks like?)

http://i.imgur.com/iIVzr.jpg

I decided to download inSSIDer since I've been having issues with browsing on my desktop and laptop, but I don't know if this means anything. Browsing is fine on my iPhone and wifi-only iPad.