I duuno LOLkokomo1 said:
This is an old joke that still folks want to make up things it's used for.jhooten said:I put loops on the ends for a couple reason. They do the same thing the little ball does on a store bought antenna. Blunt the end so it don't poke out an eye as easily and acts as a corona ball to help disipate static build up.
A PL259 or N connector fit snug in the end of 3/4" pvc pipe, BTW.
If it is a joke it is still put out as fact, as it was 30 years ago when I went through tech school.repeater-builder.com said:Corona Discharge Noise
The other type of noise called corona is due to the flow of electrons through the antenna (tower, boom and antenna elements) into the atmosphere when a charged cloud is near the antenna (fig.2). Corona or brush discharge occurs when a charge is built up and electrostatic lines of force are developed. More lines of force per square inch appear at the sharpest points and the more likely it is that a strong field will pull free electrons from the point (note 3). Electrons pulled out from a sharp point form a corona or brush discharge. This noise can also be generated by a mobile in motion and is the reason that mobile antennas have a ball of some sort at the tip. The ball eliminates the sharp point and tries to minimize the effect. If enough electrons leave in such quantities that the air is heated and becomes ionized, a spark of electronically heated air will be visible, also known as St. Elmos Fire. Corona is a major noise source but not the only one that should be in this category. There are also streamer currents, arcing and others. When a charge is built up on the antenna and tower or other supporting structures, it is possible for arcing to occur. The arcing will occur between any insulated parts or poorly connected ones if the charge potential raises to a sufficient level which it does frequently.
Well ... one other, closely related thing, if the antenna is more than about 3" long - it leeps you from accidentally putting it up your nose and into your brain. There's actually at least one recorded case of this happening with an antenna from which the ball had come off. (It was in QST many years ago - antenna in the guy's garage, he was looking for something, tripped - end of story and guy.)n8chb said:Putting a protective ball, hook or what ever is to keep one from
putting there eye out. It does nothing else.