We investigate non-coherent FH/BFSK detection in band multitone jamming when Bayesian detection is unfeasible due to lack of knowledge on a priori jamming state probabilities. We derive joint-suboptimal decision metrics of jamming states under Minimax hypothesis testing in band multitone jamming and AWGN. A sub-optimal generalized likelihood ratio test is also explored. Simulation results demonstrate the robustness of the proposed approach which combines sub-optimal generalized likelihood ratio test with generalized FH/BFSK modulation.