Catalyzes the conversion of 1-deoxypentalenic acid to 11-beta-hydroxy-1-deoxypentalenic acid in the biosynthesis of pentalenolactone antibiotic. 1-deoxypentalenate + 2-oxoglutarate + O2 = 1-deoxy-11beta-hydroxypentalenate + CO2 + succinate Antibiotic biosynthesis; pentalenolactone biosynthesis. Belongs to the PhyH family.