Yeah, thats what I figured, so that frequency skipping/hopping radar would see the target at some freqs but not at others. Something else I think the germans tried on their uboat conning towers to defeat radar detection was to put a wire mesh over it and run a small current through it (guessing that the size of the mesh was related to the frqeuency it would work against). Unfortunately, that while it sort of worked, saltwater and ocean waves crashing into it tended to make it unusable pretty quickly.

Dreams are just nightmares on prozac...
Digital WasteLanD