‰ NOW 35 WPM ‰ TEXT IS FROM MARCH 2014 QST PAGE 31‰ TUNING FIRST, SET THE RESONANCE OF THE TRAP TO 3R620 MHZ IN THE SHACK. AFTER HAVING ERECTED THE ANTENNA, TUNE THE WHOLE SYSTEM TO RESONATE IN THE CENTER OF THE DESIRED PORTION OF THE 75 METER BAND. THIS ANTENNA WILL COVER ABOUT 200 KHZ WITH AN SWR OF 1 2 AND 300 KHZ WITH AN SWR OF 1 3 SEE FIGURE 4. NEXT, ADJUST THE LONG PART OF THE ANTENNA BEYOND THE TRAP FOR THE PORTION OF TOP BAND THAT YOU WANT TO USE. MEASUREMENTS ON THIS ANTENNA SHOULD BE MADE AT THE BASE OF THE VERTICAL ELEMENT. IF THAT IS NOT CONVENIENT, THEN USE AN EXTENSION COAX CABLE ONE HALF WAVELENGTH LONG. HOWEVER, BE SURE TO REDUCE THE CABLE LENGTH BY ITS VELOCITY FACTOR FRACTION VF. CONSTRUCTION THE ANTENNA SYSTEM HAS THREE EQUALLY IMPORTANT PARTS THE ANTENNA ITSELF COMPRISED OF THE WIRE, INSULATORS, A MEANS OF TUNING AND SUPPORT, THE TRAP, AND THE GROUND SYSTEM. ANTENNA FOR MY LOW BAND ANTENNA I USED 15 AWG STRANDED STEEL WIRE. TUNING IS EASIER IF THE WIRE HAS NO INSULATION AT THE ENDS. AT EACH END, I FOLDED IT BACK TO FORM A LOOP THAT I SECURED WITH A WIRE ROPE CLIP, AS SHOWN IN FIGURE 5. THE ANTENNA IS TUNED BY LENGTHENING OR SHORTENING THE LOOP, WHICH SHIFTS ITS RESONANT FREQUENCY. AN ANTENNA FASTENED TO A TREE IS SUBJECT TO EXTRA STRESS DURING A STORM AND THE ANTENNA MAY BREAK OR BE STRETCHED IF THERE IS NO MEANS TO ABSORB THE EXTRA TENSION AS IT MOVES. I HAVE TRIED USING SPRINGS IN THE ‰ END OF 35 WPM TEXT ‰ QST DE W1AW ƒ