The EzHotspot V4 is a single band 2.4Ghz, single radio product. If you have repeated to a particular remote wireless network, the wireless channel will be locked to that particular remote wireless network. There should be not concern about interfering wireless noise as the EzHotspot works similar to the technology known as Source:wikipedia WDS (Wireless Distribution System).
WDS is a stable and long established method of wireless repeating and one of its major characteristics is that all repeating access points and including the wireless clients need to operate on the same wireless channel. If the concerns of interfering noise is real, WDS would not have been de facto standard practiced by many system integrator today.