Sensitivity data from a customer (Thanks  Lee Zanteson !)
 
  200 MHz    35 mv
  300 MHz    35 mv
  400 MHz    45 mv
  500 MHz    45 mv
  800 MHz    65 mv
  900 MHz    45 mv
 1000 MHz    45 mv
 1100 MHz    45 mv
 1200 MHz   100 mv
 1300 MHz   220 mv
 1400 MHz   220 mv
 1500 MHz   220 mv
 1600 MHz   220 mv
 
1600 is the very top frequency.