AT Comments for getting the signal strength

Hi

i am using GPS radio in WP7504
i need to get the signal strength of GPS signal
currently i having some inconstancy with
at!gpssatinfo?
Satellites in view: 8 (1980 01 06 6 00:03:24)

  • SV: 1 ELEV: 11 AZI: 209 SNR: 30
  • SV: 3 ELEV: 62 AZI: 253 SNR: 30
  • SV: 8 ELEV: 25 AZI: 165 SNR: 28
  • SV: 11 ELEV: 9 AZI: 194 SNR: 30
  • SV: 14 ELEV: 16 AZI: 108 SNR: 24
  • SV: 22 ELEV: 57 AZI: 208 SNR: 39
  • SV: 27 ELEV: 33 AZI: 122 SNR: 30
  • SV: 41 ELEV: 73 AZI: 167 SNR: 39

in some cases with the antenna used in reference board i am getting a fix

but frequently i am unable to find any satellite or some time

at!gpssatinfo?
Satellites in view: 1 (1980 01 06 6 00:08:30)

  • SV: 4 ELEV: 0 AZI: 0 SNR: 28

the elevation data appears to be zero with multiple satellite

how to fix this if the antenna gain is changed how to inform to the chip is there any configuration need to be done for different antenna

if i use a different antenna which supports wide band AP.25M.07.0080A i am unable to get sat info and fix
the difference between this antenna and reference board antenna is that it a wide band antenna but the antenna used in mango board is narrow band antenna can i use this antenna with this chip