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Google VOACAP, it is a very good HF propagation program. Input the locations of where you think you will be and where you think the other end will be. The software will also ask for current solar flux, transmitter power, and some other variables. After running the program, look at the MUF, LUF and FOT lines.
The frequencies that the S-6 gives you should be near the FOT line for the time periods that you plan to communicate on. If the frequency plan is not executable, then no amount of dutch longwire stuff will work.
The freq plan must be workable. Unfortunately, most freq managers are bean counters.
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