Wavy line repeat

Diane,

To elaborate on the effect start, at any time you can go back to the original single instance and get immediate changes to the whole set; this can be widening and/or stretching or the opposites.

With the right placement of that original single instance you can also ensure the most accurate and versatile layout for the final use, such as a wallpaper, based on a bounding rectangle at the desired full width, here described for the width of 52 cm with 5 wavy lines:

1) You can start the line with a vertical direction, in other words starting and ending with half a Zig and having a full Zag in between; you can make it using the Zig Zag effect with just one segment for a sinusoidal curving, or piece it together from the side parts of a circle for a circular/elliptic curving, such as joins midway between the original Anchor Points creating new Anchor Points with the Object>Path>Add Anchor Points, cutting out and moving the pieces about.

2) You can place the top centre of the first instance at the right position for symmetry, X = 5.2 cm (52 divided by 5 and by 2) and Y = 0 so 5 instances will be centred on the width, then create the (no stroke/no fill) bounding rectangle (to go behind) starting at X = Y = 0, either with a single wavy line width of 10.4 cm or a full width of 52 cm.

You can still expand the effect, keeping the effect for possible later use.

Thank you so much! This has worked a treat. 

 sorry I haven't explained myself very well.

ive made this wavy line pattern and it can repeat across the way no problem, but I need it to repeat lengthways so the lines match from the top to the bottom. Does that make sense?

diane