Sign:  HERE
Handshape: Both hands are in a relaxed flat hand shape..  By "relaxed" I mean the fingers can be together, or they can be loosely separated.  The hands are not "rigidly" flat, but have a very slight curve.  The thumbs are open a little bit, but certainly not "extended."
Location:  Out in front of you, about belly height.  
Orientation: palms facing up
Movement:  Each hand moves in a small circle.  They don't go up and down.  They both move forward, then out to the side, then back toward the body, then in towards each other.
Non-Manual Marker (Facial expressions and or body language):

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Note:
You can also indicate here by pointing at the floor, raising your hands an inch then lowing them an inch.

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This works with one hand.  It means the same thing, it is just not as emphatic.

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Discussion:
The pointing version of HERE is more of a "right here" or "this very place."
It is also used with the sign come to mean "come here."
It is also used as a common single-sign response to "where" questions.  "Here."
The flat hand version is a sign that means "this location" in general.