The EW-D ASA antenna splitter has a typical noise figure of approximately 6 dB across all frequency variants.
If an EW-D AB (antenna booster) is used between the antenna and the ASA — which we recommend for longer cable runs (e.g., 20 m RG58) — the AB will also influence the overall noise figure.
If no EW-D AB (antenna booster) is used in front of the ASA, we recommend keeping antenna cable runs short, as cable loss will add to the overall noise figure.