Who's leading cable's (quiet) charge into wireless?

It’s no secret that some of the nation’s biggest cable operators are positioning themselves to expand into the wireless market in the coming months. Comcast reportedly plunked down nearly $2 billion as a deposit to participate in the incentive auction that will wrap up in the coming weeks, and Charter Communications has applied for regulatory approval for 5G experiments. Both companies are keeping their cards close to the vest as they plot their strategies, however. Comcast CEO Brian Roberts abruptly cut off a question from analyst Craig Moffett on last month's earnings call, saying only that “We’ll clarify things” at some point in the future. Charter has not been much more vocal about its plans.