In this work the assessment of prediction methods for optimal working frequency decameter range. It allowed to reveal the real state ensure units connection optimal working frequency. Elected a promising direction around this problem that has arisen. Due to high intelligence secrecy passive method angled beam to the plane of probing the ionosphere determines its appropriateness in relation to improving the mathematical apparatus, the limits of the optimum working frequency for the reduction of prediction error.
decameter radio, forecasting of optimal operating frequency