Connectorized 900Mhz line loss calculations

Can anyone confirm my calculation and data below?

900Mhz Antenna (an900) - 9.1db gain
Cyclone band pass filter - 1.5db loss
Built in Pigtail on 900Mhz Connectorized AP/SM - .57db loss
Built in Pigtail on 900Mhz Antenna (an900) - .57db loss

Total - 6.46 gain

The lowest antenna gain I can configure the 900Mhz radio for is an 8db gain antenna, which will therefore drop the EIRP down to 2.48 or there about.

Does the above make sense or am I calculating this all wrong?