Darren,

You can go as high as  your local town, XYL and bank account will let you. 
Above 200 feet, it needs to be lighted and I think painted per FAA regs and 
you have to file with the FAA.   I did a Google search, and while I couldn't 
find exactly what I was looking for, like an FCC rule, there were a few 
references to being within 2 miles of an airport having to  limit hight and 
file with the FAA.

I'm pretty sure that being 3.5 miles from a small airport puts you far 
enough away so that the airport will be the least of your  problems.

73, Steve KW3A
----- Original Message ----- 
From: "Darren Tomblin" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Monday, January 19, 2009 2:11 PM
Subject: rule question


> Hi, I was wondering if anyone knows how high an antenna can beput up. I'm
> 3.5 miles from the greenwood, in airport it's a small one. just wondering
> how high I can go before having to do anything. thanks
> 73,
> Darren Tomblin (KC9JJJ)
> [log in to unmask]
> http://www.geocities.com/CollegePark/Plaza/8579
>