Written by Bob Losie.

DB ATTENUATION PER 100 FEET.

Coax TypeVel %Size146 Mhz223 Mhz445 Mhz1000 Mhz
9913 (Foil+Braid)84.4051.61.92.74.5
RG-8U Foam (8214)78.4052.22.94.47.0
RG-213 (NON-CONTAM.)66.4052.73.45.08.5
RG-8X (MINI-FOAM)78.2424.55.78.413.5
9311 (100% SHIELD 58U)78.1935.36.69.414.5
RG-58U (SOLID CENTER)66.1935.57.110.517.0
RG-58A/U (STRANDED CTR)66.1936.18.012.321.54

E-Mail George n0sbu@arrl.net

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Here is a great link.  Coax Loss Calculator.