This whitepaper gives a summary of Isode’s approach to providing products for HF radio, looking at current and future products, explaining the problems being addressed. The paper starts by looking at why HF Radio is an important technology for BLOS (Beyond Line of Sight) communication, despite its technical difficulties. The paper then sets out Isode’s “Everything above the Modem” vision for providing applications over HF Radio. It then considers current HF deployments, technical developments which can enable improvements and missing standards that inhibit them.