72399
This leads to the following equations : Directivity D _ = \ frac = 2D _ This leads directly to the earlier stated maximum gain relation to a dipole by the definition of gain a G = \ epsilon D where \ epsilon is the antenna radiation efficiency .
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Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities:  
Answer:
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