-
You can now help support WorldwideDX when you shop on Amazon at no additional cost to you! Simply follow this Shop on Amazon link first and a portion of any purchase is sent to WorldwideDX to help with site costs.
antenna and height
- Thread starter BammBamm
- Start date
That graph is not a radiation plot of a vertical antenna; looks like the plot of a Yagi beam to me.
First of all, let's understand that each color is the antenna radiating at a different height above ground.
30, 35, and 40 ft - respectively.
Look at this radiation plot as if you were standing and looking at a Yagi beam antenna pointed twards the East, and you are South of that beam antenna. Those two larger lobes are the angles of radiation relative to the horizon. There are two main lobes, and these will both 'shoot' RF radiation twards the ionosphere at those same two different angles. The longer lobe is 15 degrees to the horizon and stronger, and the shorter lobe isn't quite as strong and is approximately 45 degrees to the horizon. The longer lobe is at a lower angle and throws the radiation potentially farther.
When you were a kid and threw small, flat stones across a pond - you had to throw them at a low angle at that pond if you wanted that rock to skip across the pond as many times as it could. Perhaps a poor analogy; but fair enough . . .
Last edited:
In my experience with vertical CB antennas I was amazed at the difference when raising the base of my antenna above the roof peak, and it was even better in the direction of the house.
I don't recommend installing CB antennas on the house, but getting it above the peak should show you a really nice increase in local performance, in addition to the increase in height.
Wow I'm amazed at the responses I've received and I like the one of do it and let us know. I will as soon as my move is complete. First it's furniture and beds and clothes then I get to put my radio back together. These are the wifes rules as I must go mobile for a while until the house is setup. My entire base is now down and boxed up awaiting movement to new home. I should have it up within 2 weeks or less and will post the outcome. Thanks to all.
Yes I got moved..actually a lot has changed on my base setup, I'm now running a uniden 980ssb in both the mobile and base and stay away from extra channels and as for the antenna..It's now a gainmaster until I finish the mobile then I am thinking about a 4 element beam horizontal on a 45' tower I scavenged and repaired with the gainmaster on top with a antenna switch.
Probably be better performing with an Imax or metal 5/8 that requires 1/4 wave length radials and leave off the radials and use the yagi for them.
gain masters don't like to be near other antennas.
Oh and as for the antenna difference in heigth..yes it seems to get out better and as far ar recieve it seems the same? I changed to the gainmaster about 1 1/2 years back and noticed the noise level went down a bit but otherwise not much difference.
haha wow surprised I got a response. Thanks for the update It is always good to hear others experiences.