  The polar phase of superfluid $^3$He is stable in "nematically ordered"
densed aerogel. A rotating vessel with the polar superfluid can be filled
either by an array of the single quantum vortices or by an array of the
half-quantum vortices.
  It is shown that the inhomogeneous distribution of the spin part of the order
parameter arising in an array of half-quantum vortices in strong enough
magnetic field tilted to the average direction of aerogel strands leads to the
appearance of a satellite in the NMR signal shifted in the negative direction
with respect to the Larmor frequency. The satellite is absent in the case of an
array of single quantum vortices what allows to distinguish these two
configurations. The polar state in the anisotropic aerogel with lower density
transforms at lower temperatures to the axipolar state. The array of
half-quantum vortices created in the polar phase keeps its structure under
transition to the axipolar state. The temperature dependence of the
vortex-satellite NMR frequency is found to be slower below the transition
temperature to the axipolar state.
