There's no option to use an Anchor Upgrade, but I read somewhere that it's not needed because of FTB Chunks. However, it seems that no matter what I do I just can't get it to work.

I made the multiblock at my base, and one deep underground but close to my base, only about 3 chunks away. I have tried setting a frequency at my base and then linking to the mine. I tried setting a new frequency at the mine, then at the base. Still only one way from Base -> Mine. I dismantled the mine multiblock and redid it. Still one way from Base -> Mine. I then destroyed both and made the mine teleporter first, with the teleporter block from base, then made the teleporter at base, with the block from the mine. Still only works from Base -> Mine.

Any ideas what I could be doing wrong?