can't figure out a logical solution

Hi,
I need to build an awning/trellis in front of a very long window.
The idea is to build three of these units and run aircraft cable between them so Hops will have something to grow along.
The problem is I can not find or "think how to accomplish the base of it.
In my head it's a 1-2' long 2x6 anchored into concrete and then sandwich it on either side with two more 2x6's etc. etc.
I can't find an anchor that will accept a 2x6. 4x4 seems to be the smallest.

If any of you were doing this...how would you do it?

Thanks a lot.