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dB describes a ratio.

8.5 dB/100 m is an example, not a claim about a cable model.

With 0 dB feed loss and 2.15 dBi gain, ERP equals the entered transmit power.

145 MHz over 10 km gives approximately 95.68 dB free-space path loss.

Levels use dBm, gains dBi and losses dB.

SWR 2:1 means |Γ| = 1/3, approximately 11.11% reflected power and 9.54 dB return loss.

Ten times the bandwidth adds 10 dB of noise power.