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SWR/Reflected power doesn't care what mode you're using. 

 

Take a sheet of graph paper and start with channel 1 and continue through 40.  Make a good, clear graph so you can see for yourself just where the sweet spot is.  Label the graph and keep it in a binder for reference.  I've made well over 200 antennas in the past 50+ years, and I've done this for all of them.  It's a good resource for planning new wires.