If you are using this in the US, you may want to consider FCC 15.204

http://www.hallikainen.com/FccRules/2005/15/204/


   (c) An intentional radiator may be operated only with the antenna with
   which it is authorized. If an antenna is marketed with the intentional
   radiator, it shall be of a type which is authorized with the
   intentional radiator. An intentional radiator may be authorized with
   multiple antenna types.


Harold


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