‰ NOW 25 WPM ‰ TEXT IS FROM JUNE 2017 QST PAGE 47 ‰ COUPLED RESONATORS. THE IMPEDANCE ON THE COUPLED BANDS IS DETERMINED BY THE ELEMENT DIAMETERS AND SPACING FROM THE FED ELEMENT. FOR THE 13 AWG WIRE I SELECTED SEE TABLE 1, THE SPACING NEEDS TO BE ABOUT 1R2 INCHES FOR A GOOD MATCH TO 50. BOTH COUPLED WIRES SEE FIGURE 1 NEED TO BE THE SAME SPACING FROM THE DRIVEN DIPOLE, SO THE 20 METER ANTENNA MUST BE IN THE CENTER, BETWEEN THE OTHER TWO. AFTER THE ENDS OF THE 10 METER HALF WAVE ARE REACHED, THE TWO REMAINING WIRES REQUIRE A SIMPLER SPACER. MODELED PERFORMANCE MODELING YIELDED THE SAME PATTERN AND GAIN AS WOULD THREE SEPARATE HALF WAVE DIPOLES, EACH HAVING ITS OWN SPACE. FIGURE 5 SHOWS THE MODELED PATTERN OF THE 15 METER DIPOLE, INCLUDING THE LOSS OF THE ATTACHED COAX. YOU CAN BUILD AN ANTENNA LIKE THIS FOR THE 30, 17, AND 12 METER BANDS. WE HAVENT BUILT ONE, BUT USING THE SAME WIRE TYPE AND SPACING, AND A HEIGHT OF 40 FEET ABOVE TYPICAL GROUND, THE MODEL PREDICTS GOOD ‰ END OF 25 WPM TEXT ‰ QST DE W1AW ƒ