20 Radiosondes (Weather Balloons)
Frequency: 400 to 406 MHz
Frequency 1668.6 to 1689.8 MHz
Robert Bureau, who gave the name Radiosonde to his device, launched the very first one on the 7th of January 1929 in France. It returned precise encoded telemetry from its weather sensors.
Modern devices generally have a GPS receiver, temperature sensor, two pressure sensors, a humidity sensor and are launched several time a day all around the world to collect raw data during their accent for the global prediction of weather.
Some examples of their spectrograms can be seen here:
Individually they do not use much bandwidth (minimum of 200Hz, typically 20kHz and up to 1MHz), but the LimeSDR could monitor all frequencies at once in either band, but probably not both bands at the same time. And there is an open source project to demodulate a lot of Radiosondes (depending on the manufacturer, each uses their own protocol):
Here is a hardware teardown of a Vaisala RS92-SGP Radiosonde:
