Hmm...so zero points for me on being observant I drive 290 every day and haven't seen it. I'll try to spot it tonight on the way home.
I was driving outbound on 290 (coming from downtown). It is on the inbound side (but facing outbound traffic) around the Fairbanks N. Houston exit.
How crazy is it that now I'm going to drive that way just to see the billboard!?!?! Near what exit on 121?