Minimum distance for RBLHGG-60adkit

I don’t work for Mikrotik, but do work for a WISP who has deployed over 400 Wireless Wire radios, 50 of which are dishes.
The original Wireless Wire product was designed for distances up to 100 meters and later 200m with software updates. The furthest wAP link we have is solid at about 175m. This is perfect for your distances.
The dishes were designed for up to 1.5 km and in our experience the quality of the link suffers if they’re too close. You used to be able to turn down the TX power which helped, but this has been removed from newer firmwares: http://forum.mikrotik.com/t/w60g-tx-power-setting-gone-in-latest-firmware/123819/1 If you tried to deploy dishes at that range your connection would probably suffer too.