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We consider the phenomenology of a fermiophobic Higgs boson (h_f) at theLarge Hadron Collider (LHC) and a e+e- Linear Collider (LC). At both machinesthe standard production mechanisms which rely on the coupling h_fVV (V=W,Z) canbe very suppressed at large tan beta. In such cases the complementary channelspp to H^\pm h_f, A^0 h_f and e+e- to A^0 h_f offer promising cross-sections.Together with the potentially large branching ratios for H^\pm to h_fW* and A^0to h_fZ*, these mechanisms would give rise to double h_f production, leading tosignatures of gamma gamma gamma gamma, gamma gamma VV and VVVV.Comment: 19 pages, 9 figures, expanded discussion, fig.1 changed slightly,  version to appear in Phys.Rev.

Double fermiophobic Higgs boson production at the CERN LHC and a linear collider