  Three major misconceptions concerning quantized tachyon fields: the energy
spectrum unbounded from below, the frame-dependent and unstable vacuum state,
and the non-covariant commutation rules, are shown to be a result of
misrepresenting the Lorentz group in a too small Hilbert space. By doubling
this space we establish an explicitly covariant framework that allows for the
proper quantization of the tachyon fields eliminating all of these issues. Our
scheme that is derived to maintain the relativistic covariance also singles out
the two-state formalism developed by Aharonov et al. [1] as a preferred
interpretation of the quantum theory.
