Homemade antenna getting interferance

[dbdreams]

I made myself a homemade antenna that works great at home but here at the shop I am alongside a major US highway and everytime a big deisel truck comes by it makes the signal freeze. Most of my signals are in the high 80's or low 90's on the signal meter but somehow the trucks are interfering. Can anyone give a possible explanation why this is happening so I can try to remedy the problem?

[H-D]

I bet it's the micro-wave band comm. system that allows them to drive past scales once their load weight & other information have been entered. It's called some kind of pass. Can you orient your antenna to a different , but suitable source? If your home-made is of the Pave-Hovel(?) design, have you tried putting a reflector behind it? That's every bit as far as my knowledge goes I'm afraid.

[ProjectSHO89]

I made myself a homemade antenna that works great at home but here at the shop I am alongside a major US highway and everytime a big deisel truck comes by it makes the signal freeze. Most of my signals are in the high 80's or low 90's on the signal meter but somehow the trucks are interfering. Can anyone give a possible explanation why this is happening so I can try to remedy the problem?

It has nothing to do with any communications transmission from the trucks.... You are experiencing dynamic multi-path. The incoming signal is bouncing off the moving vehicles and is arriving out of phase with the primary signal, causing a disruption of the primary signal.

Your solution is simple and there are several possible ways of doing it:

Best would be to re-locate the antenna higher so the reflected signals are weaker.

Replace the antenna with one that is more directional in the vertical axis such as a Yagi. Get one with a tilt-bracket so it can be aimed upwards.

Re-locate the antenna to a spot where it can see the radio horizon but the view towards the highway is shielded, preferably by metal.

One or more of these will likely solve the problem.