Richard,

As to question #1, I don't know about any self-supporting mast that tall. 
You might be able to screw an anchor into the facia which wouldn't be very 
noticeable.

The formula you want to solve for the length issue is 81Squared equals the 
squares of 20 plus X where X is the distancee to the ten-foot anchor points. 
Twenty is the 30 foot center height minus the 10-foot ground height.

Solving for this in this case:
81Squared = 6561; 20 feet squared is 400, so the length is the square root 
of 6161 which is about 78.5 feet.
Take my advice, I don't use it anyway.

Steve
Lansing, MI
----- Original Message ----- 
From: "Richard Fiorello" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Friday, February 03, 2012 7:11 PM
Subject: masts


> Hi;
> I haven't asked any incredibly stupid questions in a week or so and the
> mast discussion has me thinking.  My problem is that the house is brick
> and I'd rather not drill.  Has anyone seen anything that was self
> supporting?
> Secondly if I used a dxcc which is about 81 feet, if the center were up
> at most 30 feet how low would I want the legs.  Once we decide that, for
> example, the ends should be ten feet up, given the angle how much
> physical room do I need?  I knew there was some reason for geometry but
> always hated it.
> As for the person considering the higher mast, if the performance isn't
> terrible where it is I don't think I'd change.  I got the brilliant idea
> back in the 1970s when I was in the country and had helpers to raise my
> beam about 8 feet.  Didn't notice any difference and it certainly was a
> project.  I had it mounted on a flag pol rather than a tower and the pol
> tilted.  The extra eight feet made the thing much heavier and much more
> difficult to deal with.  At least with a wire you should be able to
> arrange some sort of pulley arrangement.
>
> -- 
> richard