NVIS works very well… except when it doesn’t
Near Vertical Incident Skywave (NVIS) propagation works wonders when the bands cooperate, but can slam the door shut at any moment.
60m
Articles including references to the channelized 60m (5 MHz) HF amateur radio band.
80 Meters for BigIR
The BigIR antenna from Fluid Motion looks like a winner, but there are some concerns about the 80 meter option.