I have two of these. They are both 5/8-11, however they were both tapered. The 
taper can be removed with a hand tap. 

Denny


> On Oct 29, 2019, at 15:01, Bob kb8tq <[email protected]> wrote:
> 
> Hi
> 
> The ones I’ve seen all thread fine onto the standard survey poles. I believe 
> that is a 
> 5/8-11 thread.
> 
> Bob
> 
>>>> On Oct 29, 2019, at 7:54 AM, David C. Partridge 
>>>> <[email protected]> wrote:
>> Hi all,
>> I just received one of these and of course it doesn't fit the Shakespeare
>> 4705 Adapter (1" mast to 1" 14tpi UNS) which fitted my old antenna, as it's
>> way smaller than that (somewhere around 5/8")
>> Does anyone know:
>> a) What thread it actually is?
>> b) If an off the shelf adapter from either a 1" pipe or 1" 14tpi UNS male to
>> this thread is available and if so what/where?
>> Many thanks
>> David
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