I don't know the specifics of the installation but there are basic guidelines for any installation of RF feeder cables (and we'll restrict this to coaxial cable for this exercise).
1) All cables will have some signal loss.
2) With any given cable, the loss becomes higher as the frequency of the signals transmitted gets higher.
3) Poorer quality cable (invariably lower priced cable) may well have other issues like insufficient shielding, or an earlier deterioration of the outer jacket due to UV or weather degradation.
As a general rule, use the best cable you can find, pay the extra (once only) cost and enjoy the result knowing that you have done all you can in this area to get the best signal to your equipment.
FWIW
FOR