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First, by "surprisingly well" I meant that I expected it to do poorly being inside the attic. It surprised me by working as well as it did. Outside loops do better, but I made contacts locally and long distance with it.
I study the science from time to time, but I prefer to build it and see whether it works.
Along the way I learned that impedance changes along the length of a radiator (antenna). Think of the simple dipole, a half wave radiator cut in the middle and fed there. The impedance is ~73 Ohms. Next, make a duplicate half wave radiator but cut it roughly at the 1/3 - 2/3 length and feed it there. The impedance is not 73 Ohms now, but ~100 Ohms. Move the feed point up and down the 1/2 wave radiator and it keeps on changing. I can't tell you why birds get to fly, and earth worms don't, but I know that's the way it is.
I learn just enough science to build antennas and capture RF waves from the atmosphere.
Good luck. If you have half as much fun building antennas as I have you'll have more fun than most folks do.

<blockquote data-quote="HomerBB" data-source="post: 754575" data-attributes="member: 8569">First, by &quot;surprisingly well&quot; I meant that I expected it to do poorly being inside the attic. It surprised me by working as well as it did. Outside loops do better, but I&nbsp; made contacts locally and long distance with it.I study the science from time to time, but I prefer to build it and see whether it works.Along the way I&nbsp; learned that impedance changes along the length of a radiator (antenna). Think of the simple dipole, a half wave radiator cut in the middle and fed there. The impedance is ~73 Ohms.&nbsp; Next, make a duplicate half wave radiator but cut it roughly at the 1/3 - 2/3 length and feed it there. The impedance is not 73 Ohms now, but ~100 Ohms. Move the feed point up and down the 1/2 wave radiator and it keeps on changing. I can&#039;t tell you why birds get to fly, and earth worms don&#039;t,&nbsp; but I know that&#039;s the way it is.I learn just enough science to build antennas and capture RF waves from the atmosphere.Good luck. If you have half as much fun building antennas as I have you&#039;ll have more fun than most folks do.</blockquote>

[QUOTE="HomerBB, post: 754575, member: 8569"] First, by "surprisingly well" I meant that I expected it to do poorly being inside the attic. It surprised me by working as well as it did. Outside loops do better, but I made contacts locally and long distance with it. I study the science from time to time, but I prefer to build it and see whether it works. Along the way I learned that impedance changes along the length of a radiator (antenna). Think of the simple dipole, a half wave radiator cut in the middle and fed there. The impedance is ~73 Ohms. Next, make a duplicate half wave radiator but cut it roughly at the 1/3 - 2/3 length and feed it there. The impedance is not 73 Ohms now, but ~100 Ohms. Move the feed point up and down the 1/2 wave radiator and it keeps on changing. I can't tell you why birds get to fly, and earth worms don't, but I know that's the way it is. I learn just enough science to build antennas and capture RF waves from the atmosphere. Good luck. If you have half as much fun building antennas as I have you'll have more fun than most folks do. [/QUOTE]

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