Non-Comm band translators OWNED and OPERATED by the non-comm licensee of the FX may be fed by any means. This can include aural intercity relay on a secondary basis, satallite, off-air, off-air via another FX, IP, etc.
However, comm band translators (>92 mhz) may be fed off-air by the main station signal OR another translator; see 47 CFR 74.1231(b). There is a provison in Part 74 that notes that translators may not become a "relay network" or chain to feed others, and must serve an audience; see 47CFR74.1231(c).