The majority of these are spectrum analyzer antennas for measuring electric field strength. There are also some FM broadcast and WIFI antennas.
Various lengths and types of cable with different types of adapters.
General accessories include everything from test leads to heaters to tool boxes to wire nuts. If you can't find it anywhere else, look for it here.
Preamplifiers amplify a sensor or other electronic signal, typically for use with a spectrum analyzers and oscilloscopes
Beehive Electronics was incorporated in 2004. They are currently headquartered about one hour north of San Francisco, California. They provide RF test equipment, such as EMC probes. They also offer consulting services in RF circuit, analog, digital, and software design.