QRZ Forums. Guys, I am looking to build a large horizontal loop suspended from the trees at the new QTH, esp for m operation where it will be the only antenna I can fit in without crossing over the house well, I think I could probably make a folded dipole or Cobra work, but that isn't the point of the question.
I have read that a full wave loop should be cut for about ', and fed with window line. The lot is big enough that I can actually make the loop ' or so.
I plan to feed it at the southwest corner to try and point the gain towards the northeast, though normally at M at ' the antenna pattern is straight up.
If the length gets longer than a fullwave, does it become more directional and have a lower angle of radiation? How high is the loop? Oops, I see it, 50 ft. Last edited: Aug 1, He states 50' so not high enough to make any difference in directionality unfortunately. Most of the radiation will be up and down rather than out. But not to discourage the OP by any means; this loop should still bring in some results when conditions, timing and luck favor him.
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Some sites basically say get as much wire in the air, connect it to ladder line of any length, and off you go. Other sites suggest specific resonant wire lengths and say to avoid any multiples of wavelengths of ladder line to feed. So, here is what I know I will do, and hopefully you guys can fill me in on the rest.
The rig is located on the 2nd floor of my house. The coax run should be quite minimal, less than 10' is my guess. The plan was to run ladder line from this balun, straight away from the house and up to the feed point of the loop.
I should be able to get 30' or so of ladder line without trying, but if I should get more or less, I can adapt as need be. So, how long should the loop be, and how long should the ladder line be or not be for 80 meter operation, retaining as many bands as possible above 80?
I do like to run digital on 80, so I would prefer this to be able to go down to the lower portions of the 80m band if at all possible. I would really love 80, 40 and 20, but honestly if there was a way for me to get it all, 80, 40, 30, 20, 17, 15, 12, and 10, I would be super pleased. Thanks for your help. Last edited: Feb 9, AE0MT , Feb 9, Well as you've read you can just get a lot of wire up in the air, close the loop and tune it via your ladder line, balun, short coax feeder and tuner.
That actually does work quite well and is often the best for matching your available supports. But you can make the tuning really easy on the fundamental band and its odd harmonics by cutting the loop to full length on the lowest band.
But again it really doesn't matter too much if you're feeding the loop via ladder line and tuning in the shack with a decent wide range tuner. Start with enough feedline to reach between the antenna and your balun perhaps with a small drip loop in the ladder line but not enough slack to whip around and get tangled or touch any conductive objects when the wind blows. In many if not most cases that works fine.
Good luck and let us know how the project goes, -Dave.View 23 photos for Rochester Loop, Davenport, FL a 3 bed, 2 bath, 1, Sq. Ft. single family home built in that sold on 11/15/