In what values are RF transmission line losses expressed?

RF transmission line losses are typically specified in decibels (dB) over a standard length, such as per 100 feet or per 100 metres. This allows radio operators to calculate the total signal loss for their specific cable run by multiplying the loss factor by their cable length. Ohms are used to express characteristic impedance or resistance, not signal attenuation over distance. Decibels per MHz is incorrect because while loss does vary with frequency, the standard specification is always given for a specific frequency over a unit of physical length.