GPS data acquired simultaneously via two Garmin 25 LVS receivers located in the vicinity of 36 48.15' N 
121 47.16' W.  Receivers were set up to record the NMEA 0183 GPGSV sentence, consisting of azimuth, 
elevation, and signal to noise ratio for each satellite ID in the visible constellation.   

Signal to noise ratio over 20 is considered "good." 

Two sets of of data have so far been acquired.  On 01 March 2001 a Webb fin antenna plus Starlink in line 
20 dB LNA was tested against a Micropulse 3181 ZW (passive) patch antenna.  On 14 March 2001 the same
 Webb antenna/LNA combination was tested against a Micropulse 1882ZW (internal 20 dB LNA).

The files of data are named:

mp0db0301.txt
mp20db0314.txt
webb0301.txt
webb0314.txt

Two matlab files are also included.  The first is readgpgsv.m -- it reads the text file of NMEA 
0183 GPGSV sentences and loads the data into a rectangular array.  The second file is displayAntenna.m -- 
it utilizes readgpgsv and then creates three plots.  The plots are SNR vs satellite ID, skyplots, and SNR vs 
satellite elevation.  Run the script from the matlab prompt as follows:

>>  displayAntenna('c:\directoryname\filename.ext');