In this study, author characterized and evaluated the effect of simultaneous multiple partial-band interference on a single communication link employing frequency hopped spread spectrum (FH/SS) signaling, M-ary frequency shift keying (FSK) modulation with non-coherent demodulation, and reed-Solomon coding. Exact expressions for symbol error probability are derived in the absence of multiple access interference. Although, the analytical methods presented here, are valid for any number of multiple interferers, we restricted the numerical evaluation to the cases of two and three partial-band noise and tone jammers interferers. For fixed values of the spectral densities of noise jammers, or the energies per symbol of tone jammers, author evaluated the worst-case fraction of the band that each jammer should provide in order to maximize the probability of error of the FH/SS communication system. For the range of the signal-to-jammer power ratios considered, multiple noise or tone jammers appears to have no advantage over a single noise or tone jammer of equivalent spectral density, but achieve approximately the same worst-case performance by jamming smaller fractions of the radio frequency band.