Loss at 10 MHz is much less than 1 dB per 100 feet. Maybe about 0.4 dB per 100 feet per one listing. At that rate, to lose 1 "S" unit (6 dB) would require a coax length of 1500 feet. Even adding connectors, losses at the low end of HF are not a major concern, as long as the connectors are kept dry as previously noted. But as frequency increases, cable loss begins to increase by a lot. At UHF, the become critical, and better cables are called for in longer length runs.