Assuming the heat question was from a safety standpoint, I'd be more concerned with corona discharge than heat.
Many attic antennas have very limited attention paid to insulating the high-impedance points, assuming the dry wood rafters are adequate. There are been reports of fires caused by just such assumptions where the high impedance end of the wire was near dust and other combustible materials. Ron AC7AC ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html