The NRF wireless transceiver modules currently supported in the firmware have reliable working ranges up to 100 metres, but are generally suited for short range acquisition tasks.
The SX1276 chipset from Semtech allows long range transmissions up to 15kms line of sight while being extremely power efficient at the same time.
Its frequency is configurable over a wide range, and several modules tuned to various open frequency bands such as 434MHz, 868MHz etc are available.
Since it is an SPI device, and high data rates is not one of the features, the library can be added to the python module's SENSORS submodule