Indoor antennas worthy of 007
Many amateur radio operators today live where the installation of an outside antenna is next to impossible. It appears that homeowners associations are looking out for the dreaded amateur radio antenna non-compliance. [Peter] can sympathize and has a solution based on the lessons of espionage from the Cold War.
[Peter] indicates that spies like that [Krogers] had to report British Navy secrets like plans for a nuclear boomer submarine to Russia, but didn’t want to attract the attention of her neighbors. In this case, the transmitter itself was so well hidden that it took MI5 nine days to find the first. So it was clear that there wasn’t a huge antenna on the roof. If it had, authorities could simply follow the lead to find the radio. A hidden spy antenna might be just the thing for a ham radio broadcaster with limited action.
The antenna die [Kroger’s] a wire 22 meters long was used in the attic of their house. Remember, the old tube transmitters were less fussy about the SWR, and by setting the load circuits you could broadcast in almost anything. Paradoxically, older homes work better with indoor antennas because they lack things like solar cells, radiation barriers, and metal insulation.
How many people, [Peter] likes loop antennas for indoor use. It also shows other types of indoor antennas. They’re probably not as good as a proper outdoor antenna, but you can make some contacts with a little skill, luck, and good spread. [Peter] has some spy radios which are always interesting to watch. By today’s standards, they’re not particularly small, but positively small for their day. Video after the break.
If you think spy radios were small then, see what you can do now. On the other hand, some of the most famous Cold War spy radios did not have an obvious antenna or even required power.