Tom is right! The likelyhood of finding the culprit antenna is akin to being struck by lightning on a clear, January day.
As stated earlier, living in an older home usually means most of the electrical outlet connections are no longer firm. While this takes a little time, it's well worth it to snug down the screws attaching the wires to each outlet. Over the years, in my case 35, they will become loose from repeated expansion and contraction due to temperature changes. This makes for poor grounding circuits and low voltages, conditions that can also become a fire hazard. I tightened all of my connections two years ago, and this was the 3rd time I did it. It only took a few hours, but nearly every connection was loose enough to get a slight turn on the screwdriver. While a poor connection would likely not pose a fire threat if it were just hooked up to a lightbulb, if the same connection was used for a window air conditioner or de-humidifier the potential is very real.
Play it safe and check them out,
Gary
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Travlin' Easy