70427
Interference in the spectrum In November 2005 , many automatic garage doors in Ottawa , Canada , had suddenly , [ 1 ] and strangely , stopped working , due to a powerful radio signal that appears to be interfering with the remote controls that open them .
 Ottawa , Canada
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Ottawa , Canada