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1

You've received several good answers here. To Brian's answer suggesting that you should try powering it from a battery, I would add start with your own house before running around the neighborhood with a radio by turning off your main circuit breaker. This will determine whether or not the RFI is coming from something in your house, which is quite likely. ...


2

You might consider an RF choke at the interface between your radio and feed line. The choke at the feed point will help prevent common mode current reflecting from the antenna... but the outside of the shield can still be a source of noise on receive if it's not also choked at the receiver. In fact, you might test what happens when you put a dummy load at ...


2

If the RF noise is that strong, then you should be able to pick it up with a much smaller movable antenna. Even scrap wire or conductive tape on a large cardboard box. That may allow you to build small directional antennas (tiny loop and stub dipole) to determine if the noise is stronger from some specific directions, or a polarized antenna to determine ...


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