If none of the additional methods, equipment, or services exist....what do you do to achieve traffic separation in the end.....look outside of course or gamble blindly relying upon the small aircraft big sky method?
great idea unless the traffic (as with my colleague and the UK crash) is coming at you from above and behind (can't think of any helicopters with visibility that way) so unless you select A-10 mode and never have the wings level, your only hope is electronic assistance.