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Eddie,
the way i look at it is we can never know the electrical length of our feedline common mode path so theres no point including it in a model,

BUT we should remember that the coax is exactly the same as the mast with regards cmc & just because we don't include coax in the model does not mean it won't have an effect,
you will be lucky if it does not if you take no measures to isolate the outer braid,

a mast will show cmc & pattern skew the same as coax outer braid, the mast is something we know the length of & if its grounded or not so its ideal for your models,

can you remove the choke from the masts so we can see the cmc & pattern with different length masts ?
i don't expect much with a 1/2wave but a99 can cause lip burning rfi,

not as bad as no radial 5/8waves.

[QUOTE="bob85, post: 734604, member: 18"] Eddie, the way i look at it is we can never know the electrical length of our feedline common mode path so theres no point including it in a model, BUT we should remember that the coax is exactly the same as the mast with regards cmc & just because we don't include coax in the model does not mean it won't have an effect, you will be lucky if it does not if you take no measures to isolate the outer braid, a mast will show cmc & pattern skew the same as coax outer braid, the mast is something we know the length of & if its grounded or not so its ideal for your models, can you remove the choke from the masts so we can see the cmc & pattern with different length masts ? i don't expect much with a 1/2wave but a99 can cause lip burning rfi, not as bad as no radial 5/8waves. [/QUOTE]

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