In my experience with the Streaming API, I have found that there are a surprisingly small number of tags with geotags. And perhaps your locations are too restrictive. But when you add a keyword parameter, as you say, you get OR'd results for both searches - Twitter does this, so you can execute multiple streaming requests on the same connection.
If you try
http:
You get answers to all kinds of answers.
EDIT: oops, also, you have your longitude and latitude back. longitude comes first in their API. This url works:
http:
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