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From what I remember from university, anhedral was used to keep the horiz stabilizer away from flutter due to engine exhaust, for example the Vickers Viscount and Comet. This was particular so at high angles of attack. The vortex in the case of stall would in such a case render the tailplane useless with catastrophic results, as demonstated by the initial models of the BAC 1-11. They solved that by installing a stick pusher, so that you would not enter a state of stall at all.
Dihedral in wings normally relates to achieve sufficient high rates of roll as required by the certification design rules, but what that would do for tailplanes is beyond me. The only aircraft I recal with such tailplanes is the F-4 Phantom. Anyone with better or more light on this?
Cheers.
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