Em waves and magnetic field lines

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physics user1
So i know that magnetic field lines are closed, in an electromagnetc wave how can be these lines closed? i cannot picture this in my head
 
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I believe they look something like the following:

Felder_um_Dipol.jpg
 
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Drakkith said:
I believe they look something like the following:

Felder_um_Dipol.jpg
Is an antenna in the middle?
 
cpxuvs said:
Is an antenna in the middle?

Yes there is. I believe that's the radiation pattern of a standard dipole antenna.