Yes for the 3.65GHz band, antenna gain does matter, because the band is 
EIRP restricted. For instance, for the XR3, if you look on the grant:

https://fjallfoss.fcc.gov/oetcf/eas/reports/Eas731GrantForm.cfm?mode=COPY&RequestTimeout=500&application_id=930658&fcc_id=SWX-XR3B

The maximum output (in watts) is 4.2, 4.7, and 4.7 for emission 
designators (4M24D7D,8M44D7D,17M2D7D), or 5/10/20 MHz channel bandwidths 
respectively. Thats ~ 36dBm total *EIRP*

If you look at the test report:
https://fjallfoss.fcc.gov/prod/oet/forms/blobs/retrieve.cgi?attachment_id=900106&native_or_pdf=pdf
(Page 36)
It shows the max tx power tested by the FCC Lab which still met spectral 
density requirements. If you are using the XR3 at the allowed max 
txpower (~18dBm), you must use less than or equal an 18dBI antenna.
(This should be specified in the user manuals you received when you 
purchased the XR3)

Hope that helps...

-Matt

rea...@muddyfrogwater.us wrote:
> Antenna gain does matter.
>
> UBNT has only one certified antenna combination - or did back when I first 
> filed for the license.   Useful only for P2P, actually.
>
> You have to specificy EIRP, which UBNT's grant details, using the antenna 
> specified.
>
>
>
>
>
> ++++++++++++++++++++++++++++++++
> <insert witty tagline here>
>
> ----- Original Message ----- 
> From: "Mike Hammett" <wispawirel...@ics-il.net>
> To: "WISPA General List" <wireless@wispa.org>
> Sent: Friday, March 06, 2009 9:38 PM
> Subject: Re: [WISPA] 3.65 ptp
>
>
>   
>> Not mine, but....
>>
>> http://wireless2.fcc.gov/UlsApp/UlsSearch/licenseLocDetail.jsp?keyLoc=15533393&licKey=2969764&rsc=NN
>>
>> That's a Ubiquiti XR3.  It doesn't say Mikrotik or Star-OS or Ikarus 
>> or....
>> because it doesn't matter.  Nor does antenna gain.
>>
>>
>> -----
>> Mike Hammett
>> Intelligent Computing Solutions
>> http://www.ics-il.com
>>
>>
>>
>> --------------------------------------------------
>> From: "John Scrivner" <j...@scrivner.com>
>> Sent: Friday, March 06, 2009 8:34 PM
>> To: "WISPA General List" <wireless@wispa.org>
>> Subject: Re: [WISPA] 3.65 ptp
>>
>>     
>>> So Reader, are you saying you have a 3.65 GHz  license and have
>>> registered your 3.65 GHz access points and end user locations through
>>> the FCC ULS? I did not recall seeing a Star OS 3.65 FCC certified
>>> system. You are required to use FCC certified equipment and to
>>> register every AP and customer location using this band. If you do not
>>> then you are breaking the law. Since you are using WISPA list
>>> resources to discuss this as a system option for 3.65 GHz I expect to
>>> see a full answer from you here on this.
>>> Scriv
>>>
>>>
>>>
>>>
>>> On Tue, Mar 3, 2009 at 10:42 AM,  <rea...@muddyfrogwater.us> wrote:
>>>       
>>>> I am.
>>>>
>>>> Works ok. Using Star-OS. I use "ok" to designate an unenthusiastic, but
>>>> affirmative statement that it works. 3.65 seems to have unique
>>>> propagation qualities that are affected by snow, rain, and fog, moreso
>>>> than
>>>> 5 or 2.4.
>>>>
>>>> Or, that's how it seems.
>>>>
>>>>
>>>>
>>>>
>>>>
>>>> ++++++++++++++++++++++++++++++++
>>>> <insert witty tagline here>
>>>>
>>>> ----- Original Message -----
>>>> From: "Brian Rohrbacher" <br...@reliableinter.net>
>>>> To: "Conversations over a new WISP Trade Organization"
>>>> <wireless@wispa.org>
>>>> Sent: Tuesday, March 03, 2009 7:29 AM
>>>> Subject: [WISPA] 3.65 ptp
>>>>
>>>>
>>>>         
>>>>> Anyone using 3.65 for ptp? What is available? Can ubiquiti's cards be
>>>>> used in mikrotik?
>>>>>
>>>>> brian
>>>>>
>>>>>
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