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Ditto- ours are 6' in diameter, and about 60 ft (20 meters) apart, work 
well.  They're up on the second story of our accessible, 2-story ramped 
outdoor Science Park.

You can see one of our pair in the photo of our Suspension Bridge below 
(the photo would have been taken standing near the second dish):

http://www.sciencenter.org/exhibits/sciencepark.asp

We used to let visitors rotate that one to aim at traffic nearby for 
instance, but found that often the next visitor then didn't figure that 
they needed to aim it at the other dish in order to talk to their friend 
there (and yes we had a hole in the back to look through and big "Aim 
here" signage).  We finally decided to fix them both in place.

Kathy Krafft
Exhibitions Curator
Sciencenter
Ithaca, NY

On 1/30/2013 6:06 AM, Glen Moore wrote:
> ISEN-ASTC-L is a service of the Association of Science-Technology Centers
> Incorporated, a worldwide network of science museums and related institutions.
> *****************************************************************************
>
> We put our 5' dishes 40' apart - worked really well. Then we installed a temporary exhibition with metal signage panels directly between them I.e. removed the line of sight. They still worked almost as well! Presumably the sound travelled over the top of the panels and was then focussed. (?)
>
> Sent from my iPhone
>
> On 30/01/2013, at 2:37 PM, "Eric Siegel" <[log in to unmask]> wrote:
>
>> ISEN-ASTC-L is a service of the Association of Science-Technology Centers
>> Incorporated, a worldwide network of science museums and related institutions.
>> *****************************************************************************
>>
>> hi, chuck,  you might get more responses if you change the title line.  We have whisper dishes that are probably 80 feet apart, and about 6 ft diameter.  but I don't have any general rules of thumb.
>>
>> eric siegel
>>
>> On Jan 29, 2013, at 5:04 PM, Chuck Howarth <[log in to unmask]> wrote:
>>
>>> ISEN-ASTC-L is a service of the Association of Science-Technology Centers
>>> Incorporated, a worldwide network of science museums and related institutions.
>>> *****************************************************************************
>>>
>>> Hi, guys.  Does anyone know if there is an intrinsic limit on how far apart whisper dishes can be?  Would they work at a separation of 100 feet?  And if they are farther apart, does that mean that the dishes need to be bigger?  Many thanks,
>>>
>>> Chuck Howarth, Vice President
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