I don’t have any experience with billboard ads, but it seems like these days, if people see that you can afford to advertise on a billboard, they will probably just assume your prices are high and won’t call you. You might get more response from just placing a freebie ad on your local Craigslist.
I know when I’m driving I don’t generally pay that much attention to billboards since I’m too busy driving for everyone else around me.
