Data Tables

Wire Sag vs. Tension


Antennas 80m through 10m



These tables were compiled from actual test data.  They are intended to be an aid in determining the amount of tension needed to keep any flat top antenna correctly tensioned within reasonable sag limits…usually under 6%.

Test antennas were made from #12 AWG bare wire.  If smaller wire sizes are used the sag will be reduced slightly since there will be less wire weight distributed across the span.  It should be noted that the data assumes that the span of wire is attached to fixed supports at each end.  If you have support rope between the antenna end insulators and the supporting structure(s) the rope will also add to the depth of sag.  This should be taken into account when you are estimating the total depth of sag below the vertical height of the attachment points on the end supports.



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Dick Goodwin K4JJW

2217 Caracara Dr.

New Bern, NC 28560