We will explore the use of inexpensive radios that operate in the Industrial, Medical, and Scientific (ISM) bands, to make integrated relative humidity measurements.  Our hypothesis is that the effect of relative humidity on the delay between a transmitter and receiver separated by ~500 m is large enough so that we can measure the delay using simple electronics.  The electronics will most likely consist of the phase detector sub circuit found in commercial phase-looked loop ICs.  We will perform experiments at the facilities of IIHR-Hydroscience & Engineering (a unit of the College of Engineering).  This work is publishable in peer-reviewed journals.