  The anisotropic superconducting properties of a Rb(x)Fe(2-y)Se(2) single
crystal with transition temperature 32 K were investigated by means of SQUID
and torque magnetometry, probing the effective magnetic penetration depth and
the magnetic penetration depth anisotropy. Interestingly, the anisotropy is
found to be temperature independent in the superconducting state, but strongly
field dependent. This unusual anisotropic behavior, together with a large
zero-temperature effective magnetic penetration depth is possibly related to a
superconducting state heavily biased by the coexisting antiferromagnetic phase.
