I believe the relevant guidelines would be under section 6 of the second link above and the link below.
BPR-3 — Application Procedures and Rules for FM Broadcasting Undertakings - See 6. Applications for Very Low-Power FM (VLPFM) Broadcasting Stations in Small Remote Communities
Allowed ERP appears to be 10W so a 5W transmitter with a 3dB gain antenna would be compatible with the maximum allowed. Applications can be submitted by email.