Gus M0IKB said :

.. .. how far apart do I need to space .. ..

I don't know your specific antennas, and may not provide much help with this - but over the years the question has come up more than once...

Several years back I had posted some spacing/phasing information on my website, and Google still sends people looking for the old files. I've added a new page that has this old information, if it helps any. http://wb5rmg.somenet.net/2009/20090119.html - Your mileage may vary. Others may have better answers. Let us know what works best for you. 73 /;^)