How do I extend a line pattern background in Photoshop?

Question

I have an image but on the top of the image there just isn't enough room to make it applicable for my desired application. Therefore I would like to extend the pattern that is clearly visible in the background. The pattern and image are the following:

I tried using the content aware filter and this gives me the following result:

It just doesn't know how to handle the cross part. So I also tried the clone tool, and this looks good but looks like aliasing has occurred when looking from a greater distance:

What to do to straighten the lines in the last image out or redo it completely in order to get a nice extended pattern?

Answer 1

As Scott says, you'd probably be better off removing the background and replicating it. It looks as though you could create and use a pattern which would save you some time. That way would avoid all the extraneous artifacts and you could apply any other filter with ease.