A few nice Ham Radio images I found:
Microwave parts
Image by Karl-Martin Skontorp
2013-01-25 15.31.01
Image by indigoprime
High Sierra HS-1800 Screwdriver antenna
Polyphaser
Image by HAM guy
These devices are on the end of cables attached to antennas on a roof. These babies protect equipment from damage to lightning spikes.
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