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Hi Ken… I thought of another aspect that is interesting to think about.
A four-element cage monopole has been described as placing four 10-foot antennas in parallel, a practice which lowers the resulting impedance.
Compare it to four 16-ohm loudspeakers in parallel, which would give you a final load of 4-ohms.
Because of that the tuning gets adjusted accordingly. With an SStran3000, for example, it might even be cause for making the modification for lowered impedance operation described in the manual.