Originally posted by Angelo M
How high can I join the masts without needing guy wires too?
Hopefully with the narrow design of the antenna wind would not have too much drag or force, I'm not sure. I'd also need a rotor atop the mast too, so that may and some drag too.
The 4228 has a high wind load because of the large surface area. Although torque is probably less because of the narrow design, there's still plenty of metal to catch the wind if you're pointed in the right direction.
The real question is this: how strong is your chimney? You can strap anything to it, but once you securely attach it, it is only as strong as what it is attached to. Generally, mason (brick/stone) chimneys are not designed to handle torque at all, meaning that over time, wind will pull your chimney apart. If you have a wood chimney, they do better.
To be safe, I'd say you shouldn't clear your chimney by more than 6'. You might get away with more, but then again, you might not.
Guy wires provide a lot of extra strength and security, taking almost the entire wind load off of your chimney. Use silicone to seal the guy wire holes and you should be fine for water issues.
Legal disclaimer: I'm not a builder, roofer, or antenna installer. No guarantees, even for 6'.