My Inv L was 124 feet and resonant at 1.825MHz going 70 feet up the Rohn 25 tower and pulled out over 250 feet using nylon rope.......................Good idea to start longer! I used the UNUN to match it to my 50 ohm feedline and 100 1/4 radials. I had about 30 KHz of 2.5:1 BW. 73 Paul N0AH