The Latest requirement is for an SLNB to be installed with cabling running to the locations of the decoders. Only one cable is required to each decoder from the SLNB.
An antenna upgrade is also recommended if the current antenna is a small 60 cm one, but this is not essential.
The location of the decoders is important to know as well as if you want to make use of the RF signals anywhere else in the home. This does affect the choice of HB connection to some extent.
For example, if you choose to use the LNB cabling for HB, then a diplexer will be required installed right behind the Explora 1. the Explora 2A des not require a diplexer.
The existing LNB and any Explora switches you have are no longer really useable anymore.
Easyview, UEC 4T HD PVR, SD PVR, XV
Spare decoders: SD PVR(2), PACE HD PVR 4T, DSD 660, 1110, 1131, Explora
2 unmentionable FTA decoders
Win 10 Pro (64-bit) build 1607, version 14393.351
1.2m antenna, 8-way universal LNB, 2x6 MS, FSM permanently connected.