>Just a quick question - how much does kinks and bends in a coax affect its
Every coax manufacturer has a spec for minimum bend radius for each type of cable. For Belden 9913, for example, the minimum radius bend is something like 6 inches. Bending sharper changes the characteristic impedance of the cable in that area, inducing reflections (i.e., raising VSWR).
See Chapter 5 of the ARRL UHF/Microwave Experimenter's Handbook for more details.