Cb disaster!!

So, you didn't check it before you left the radio shop? I'd be calling them back, not asking here what to do.

 

Tell us where you stopped!!!

 

first thing to do is get rid of the aluminum antenna and replace it with a copper one. aluminum picks up lots of static. the second thing to do is hook the radio up to a signal generator to see how large a signal it takes to produce an audible tone in the receiver. any signal larger than 1 microvolt to produce an audible tone tells me the technician does not know how to tune a radio receiver. at that point it's time to find a better radio technician. ideally it shouldn't take more than one tenth of a microvolt of signal to produce an audible tone in your receiver. if your technician does not have the proper test equipment then it might be time to find another technician who is properly equipped

 

I have to say thank you to people like you. They say you learn something new every day and I just did. Never knew a different metal would pick up more static. I will now be fast-tracking the replacement of my Monkey-Made antenna.

 

Aluminum antenna picking up more static?

seriously?

unless the radio was messed with itself, you have a ground problem.

if your static is with the engine on and the tone changes with the speed of the engine, that is a problem with the alternator,

if it while moving, you need a static strip added to you truck.

if the tech messed with the radio, get it back on the bench to fix it.

 

Unlike shiny copper, Aluminum on the outside surface is covered with a thin layer of oxide, Al2O3 (sapphire). This insulating surface is a dielectric much thinner than the skin penetration depth for RF at 27 MHZ yet thick enough to allow surface charge to buildup until it breaks down through the very thin layer of sapphire as the local space charge builds up in voltage. In the wind a never ending source of 'static noise' easily heard especially if the receiver is less than a micro-volt in sensitivity. So yes, it can be proven a copper antenna has much less 'static noise' than an aluminum antenna. That is until chemical corrosion coats the copper with oxide. One conclusion being it pays to keep your copper antenna shiny at all times.

 

Which beautifully explains why, after switching to my MM-9 Long antenna, the road surface would create differences in the level of the static picked up. Going over a bridge or other concrete surface increases it by at least an S-unit at times.

 

If you include in the consideration of the total picture the tribo-electric generation going on between your tires, the road surface composition and conductivity moving this charge into the vehicle chassis. It is after all a very complex set of factors. In your case the charge is moving through the antenna's oxide layer and carried away by air molecules, which is a noise source in addition to the one I mentioned coming from charged air molecules. Direction being considered in terms of charge polarity of course. In simplistic terms consider all the various sources of noise adding, similar to the overall noise in a room increasing as more people babbling away enter the room.

Almost forgot to add consideration to the OP's problem. Look at the ground or lack thereof from the added mirror mount to the cab body. Is the bracket mounted on an arm insulated from the body? Common in newer trucks with the large diameter mirror arms. Something to look into anyway.

One further addition: Hi Rabbi, long time no hear. Or see.

 

What are the recommendations for a good Copper antenna?