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Members also share ingenious methods for tracking the effectiveness of billboard ads.
My suggestion would be to put two or more billboards up in different locations with a different 800 number on each one, and track which advertisement you get the best response from. Once you know that information, switch the billboard locations and check again. Now you have a decent idea which board is more catchy to your customers. Trash the others and only use what works. This goes with all advertising.