[NLRS] How high can I go?

[Dr. Gerald N. Johnson]

I'll be talking about stacking distances at Aurora in a couple months. 
Like Kent Britain has been campaigning, closer may work pretty well.

Pipe threads are the weakest point of the pipe and prone to breaking 
with a bending load. Been there, done that, broke it.

I'd go with a longer pipe (chain link fence top rail is well galvanized 
and not too weak) (chain link fence posts are sturdier in short lengths) 
and use long u-bolts to lap the extension. I did that for decades to 
hold a pair of RIW for 432 (19 elements each) above my mast.

73, Jerry, K0CQ

On 3/21/2011 12:11 PM, Clare Jarvis wrote:
>
>
> Matt, (KF0Q)
>
> I want to add a 222 MHz 8 or 11 element yagi to my vhf/uhf stack.  The stacking distance is about 6 feel vertical and I do not have
> that much space left.   Can I put a threaded  extension on top or do I need to buy a longer galvanized pipe?   How long a pipe can I
> put on the 40 foot tower with that thrust bearing?
>
>