In the 90s I spent a few years working on the Jindalee Over-The-Horizon-Radar. It's in the HF band and located in a quiet spot in the middle of Australia. At

In the 90s I spent a few years working on the Jindalee Over-The-Horizon-Radar. It's in the HF band and located in a quiet spot in the middle of Australia. At that time it wasn't fully operational, so there were substantial periods where the research team had exclusive access. One of the techs was a keen radio amateur and used to patch his HF kit into the beamformed antenna array. Subject to the ionosphere not being complete rubbish he could roam around to his hearts content. A further bonus was real-time access to one of the world's best ionosonde networks. It was HF nirvana.