Bunkers on the Air (BOTA) began in 2003 as a unique and innovative way to merge the fascinating world of amateur radio with the rich history of military and civil defence bunkers. It offered radio enthusiasts a chance to not only enjoy their hobby in a new and adventurous way but also to explore and bring attention to often-forgotten historical sites.

In the UK, this initiative took on a particular focus on the activation of Royal Observer Corps (ROC) posts—small, often hidden structures that once formed a vital part of Britain’s Cold War defence system. These sites, scattered across the country, have become symbolic of a time when vigilance and communication were at the heart of national security.

The original concept of activating bunkers came from Brian G8GMU and his grandson Joshua M3HBM, who, alongside members of the Coventry Amateur Radio Society, began visiting and activating ROC posts in their local area nearly two decades ago. What started as a personal and club-level initiative soon captured the imagination of others in the amateur radio world.

By 2010, this grassroots idea had grown in scope and momentum. It was formally brought under the umbrella of the Castles and Stately Homes on the Air (CASHOTA) scheme by Chris Darlington M0DOL, a key figure in developing and structuring portable radio events in the UK. Chris’s work helped standardize the process of “activating” historical locations, encouraging participation, logging, and public engagement. His vision was instrumental in setting the groundwork for what UKBOTA would become.

We owe a great deal to the early pioneers of BOTA and related initiatives. Their enthusiasm, dedication, and technical expertise not only preserved important historical heritage but also breathed new life into amateur radio for a new generation. Their contributions laid a solid foundation for the programme’s continued success.