ATEM TV Studio: Successful HDMI cables?

Howdy.

While most of the time, we will be using the SDI input connections on the TV Studio, we will want to be able to use the HDMI inputs as well.

So far, any cable we've tested longer than about 15 feet fails. We can use those cables (some up to 100') to feed monitors and other devices, but the ATEM TV studio rejects the connection. We wish the TV Studio was more sensitive in this respect. We are testing using an HMC-150 camera, and also with an AJA SDI to HDMI converter as an alternate source.

Can anyone recommend an HDMI cable that is 25' or longer, and has worked reliably with the TV Studio?

With thanks,

- Bruce Colgate