  In the last two decades Resistive Plate Chambers were employed in the Cosmic
Ray Experiments COVER-PLASTEX and ARGO/YBJ. In both experiments the detectors
were housed indoors, likely owing to gas distribution requirements and the need
to control environment variables that directly affect RPCs operational
stability. But in experiments where Extended Air Shower (EAS) sampling is
necessary, large area arrays composed by dispersed stations are deployed,
rendering this kind of approach impossible. In this situation, it would be
mandatory to have detectors that could be deployed in small standalone
stations, with very rare opportunities for maintenance, and with good
resilience to environmental conditions. Aiming to meet these requirements, we
started some years ago the development of RPCs for Autonomous Stations. The
results from indoor tests and measurements were very promising, both concerning
performance and stability under very low gas flow rate, which is the main
requirement for Autonomous Stations. In this work we update the indoor results
and show the first ones concerning outdoor stable operation. In particular, a
dynamic adjustment of the high voltage is applied to keep gas gain constant.
