It's just a normal coax cable. The only point is that many of the RCA to RCA cables which you would EXPECT to be coax are actually not...

Just for fun I tried hooking up a couple of different "normal" RCA-to-RCA cables from DVD to receiver and none of them worked.

M60ti, VP180, QS8, M2ti, EP500, PC-Plus 20-39
M5HP, M40ti, Sierra-1
LFR1100 active, ADA1500-4 and -8