  The Lockman Hole Project is a wide international collaboration aimed at
exploiting the multi-band extensive and deep information available for the
Lockman Hole region, with the aim of better characterizing the physical and
evolutionary properties of the various source populations detected in deep
radio fields. Recent observations with the LOw-Frequency ARray (LOFAR) extends
the multi-frequency radio information currently available for the Lockman Hole
(from 350 MHz up to 15 GHz) down to 150 MHz, allowing us to explore a new radio
spectral window for the faint radio source population. These LOFAR observations
allow us to study the population of sources with spectral peaks at lower radio
frequencies, providing insight into the evolution of GPS and CSS sources. In
this general framework, I present preliminary results from 150 MHz LOFAR
observations of the Lockman Hole field.
