How high up on a pole? Can they physically change the numbers or does it need to be some sort of LED display that can be changed at ground level? And what size (appx) overall will the
sign be? Need lots more details to help.
If it's at ground level, we just did a 30x36, 3mm dibond
sign that is going on a side bracket (it hangs to one side of the pole but I've seen systems that center hang - but they necessitate 2 separate
signs) with 3" letters on 3.25" PVC (black vinyl on white) with velcro. They can change the time and the date (for homeowners meetings) very easily. It looks better than track lettering and is easy to change. This is the second one I've done like that and the first is still up 3 years later in the Florida sun...