  We report the most complete analysis to date of observations of the Cosmic
Microwave Background (CMB) obtained during the 1998 flight of BOOMERANG. We use
two quite different methods to determine the angular power spectrum of the CMB
in 20 bands centered at l = 50 to 1000, applying them to 50% more data than has
previously been analyzed. The power spectra produced by the two methods are in
good agreement with each other, and constitute the most sensitive measurements
to date over the range 300 < l < 1000. The increased precision of the power
spectrum yields more precise determinations of several cosmological parameters
than previous analyses of BOOMERANG data. The results continue to support an
inflationary paradigm for the origin of the universe, being well fit by a 13.5
Gyr old, flat universe composed of approximately 5% baryonic matter, 30% cold
dark matter, and 65% dark energy, with a scale invariant initial density
perturbations.
