Firstly, recall that you are amplifying the signal before it reaches your receiver. It will amplify whatever is received. Frequently the increase noise and produce mirrors of multiples of frequencies too.

As far as the noise is concerned, is it continuous, or intermittent ? Does it seem to be man-made or is does it seem naturally generated ?

Atmospheric noise can be intense ahead of advancing storm systems, and can be a guide to when to pull the plug out of the wall S. Noise can be generated by bad power lines or dimmer switches.

Some sounds can be classified as noise in that they are generated by digital equipment at radio frequencies and is unwanted if you are a shortwave listener.

If you clip a playing card onto your tire rim, it generates a noise as it makes contact with the spokes. The faster you pedalled, the more magnificent the sound, which is why little boys put them on their bike. In a similar way, digital equipment will produce a signal as the transistors are turned on and off in the regular functioning of the machine. The faster the switching, the higher the frequency of the signal, and by the time it is switching at radio frequencies, the signal will leave the equipment as if it were a transmitting antenna. If the signal gets into the power lines, it is very difficult to remove or prevent your receiver from seeing.

Can you describe the noise ? The Navy may or may not be the culprit. If it is weather related, you can install a device to bleed atmospheric electricity off the antenna line to ground. You definitely want a good earth ground. Even a coat hanger stuck into the ground is better than nothing in reducing noise. The other thing is matching your antenna to your equipment with a matching device of some kind. Sloper antennas and loops are better at limiting noise. Some receivers have noise limiters or noise blankers which may be hlepful sometimes. There are also devices the connect between the antenna and the receiver which will use phasing to cancel some noise.

I hope this helps. Best wishes.

God gives Peace not war +