What is the appropriate commercial WiFi logo?

Everytime I leave the house, I keep my eyes open for places in the community that have free wireless internet access. This is quite an active process, for almost no two places advertise their free internet access the same way.

I often suggest that businesses that provide WiFi or free wireless internet come-up with a uniform logo, that can be placed conspicuously on the front window, or on the front door underneath the credit card logos.

What should the logo look like?

How about something like this: