Direct sampling mode frequency range?

Can someone clarify what the frequency range is in Direct sampling mode. The rtl2832u dongle has a 28.8Mhz osc. So can the dongle in "direct sampling mode" (with appropriate antenna connection) receive > 14.4 Mhz (Nyquist) ? Googling I find conflicting advice. I've been able to receive > 14.4 Mhz in direct mode, but I'm not sure if that's due to some non-optimal method...? I'm guessing it can because the tuner chip provides both I & Q data therefore allowing the double rate...?