You can download topo maps online that will give you as good as 10 ft intervals
depending on how flat your terrain is. See
On Dec 30, 2011, at 9:51 AM, William Hein wrote:
> Thanks for all for the great advice and info! TowerTalk really proving its
> value to me here.
> I am filing out FAA form 7460-1 online right now. It asks for the exact
> altitude ASL of my tower(s). How do I find this out? I can extrapolate from
> Google Maps but that won't be accurate to a foot, neither will be my consumer
> grade GPS.
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