  A massive gravitationally bound object with a radius $r \leq 2GM/c^2$, which
occurs in the non-singular version of the nonsymmetric gravitational theory
(NGT), replaces the black hole in Einstein gravity theory. This object is kept
stable by the attractive and repulsive forces generated by NGT, as well as
standard matter pressures, and is called a superdense object (SDO). The
luminosity of gravitational waves emitted by a SDO with a red-shift of order
unity is calculated and it is found that it could be a strong source of
gravitational radiation at low frequencies. The active galactic nucleus of M87
is identified with a SDO and the recent observational results obtained by the
Hubble Space Telesope are used to estimate the amplitude of gravitational
radiation.
