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The dB loss of all connectors and pigtails and cable. As a general rule of thumb you lose .5dB for each connector.

Different cables have different loss per foot.

Attenuation - dB lost /100 feet
Cable Impedance 150MHz 450MHz 900MHz 2500Mhz
LMR-100A 8.9 15.8 22.8 39.8
LMR-200 4.0 7.0 9.9 16.9
LMR-300 2.4 4.2 6.1 10.4
LMR-400 50 1.48 2.66 3.9 6.8
LMR-500 1.2 2.2 3.1 5.5
LMR-600 50 0.96 1.72 2.5 4.4
LMR-900 50 0.62 1.10 1.6 2.98
LMR-1200 50 0.48 0.86 1.26 2.3
LMR-1700 0.35 0.63 0.94 1.7