Total posts : 45366
Mram1500 is correct. There can be radiation from feedlines, especially when your antenna has a poor ground (sometimes, it’s inevitable, given condos and the like), or is horribly mismatched. Amateur radio operators have lived with this for years. The solution is to build a choke to eliminate most of that feedline RF (and it can be as simple as winding the feedline coax around, say, a PVC pipe). That will stop your cabinets from lighting up, and your appliances from turning on when you transmit. Although with Part 15 power levels, that’s not likely to occur.
Never the less, the rules do include the length of the feedline, along with the antenna length and ground. Presumably because Part 15 antennas are deliberately (by the rules) horribly mismatched, and not everyone has the knowledge or desire to build a choke.
So it really doesn’t matter whether Carl’s proposed solution would work or not. Or even if you add a choke. You’d be violating the Part 15 rules if you use a long feedline (regardless of the physics).
Unless, of course, you can convince the FCC inspector who might show up that the feedline is feeding the final stage of a transmitter, as the Talking House people did.