I've seen it mentioned in several posts that an EFWH sloper antenna should be 45-60 degrees, but I'm not sure if that's measured at the high end or low end? Or does it depend on where the feedpoint is located? For example my sloper is 37 degrees upward from the ground at the low end where my 49:1 Unun is located. This would make the angle at my high end 53 degrees.
Which end is EFHW slope angle measured
- Thread starter n1moa
- Start date
What are you trying to accomplish by tilting the antenna?
The only reason it's tilted is because I don't really have a better choice. Since my only trees are on the back edge of my lot, I have to have the high end back there and the low end up closer to my house. It seems to work ok, but I've been wondering if it could work better at a different slope angle. Also wondering how or even if the slope angle affects propagation, like HF DX vs NVIS. But at presnt I'm not even sure I'm within 45-60 degrees. It depends on whether the guidline refers to the top end angle or the bottom angle.
BTW, I'm using a 65.5' 40-10 EFHW with a 49:1 Unun.
BTW, I'm using a 65.5' 40-10 EFHW with a 49:1 Unun.
Blackswan73
Active Member
Tilting the antenna makes it more omnidirfctional. To answer the op’s original question. If one end is 45 degrees, then the other end also has to be 45 degrees if the mast is vertical. The three angles of a triangle are always 180 degrees total, so if the mast is vertical, or 90 degrees, and the bottom angle is 45 degrees, then the other angle has to be 45 degrees
B.S.
B.S.
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Blackswan73
Active Member
The angle of a slope is in reference to a horizontal plane, ie: the ground surface. The more towards vertical the sloped is, the more omnidirectional it will be
B.S.
B.S.
Ok, that does make sense to me. Tilting it all the way towards vertical would be omnidirectional, whereas horizontal would be more directional. So, I guess the slope angle doesn't have much to do with the take off angle, assuming the antenna is high enough. In my case, the high end is up 65' and the low end is up 25'.
