Wingfan, There are so many different products on the market with "coax protection", and most are ambiguous (or offer no info) as to how this is achieved...or what is actually being stopped.
In my opinion, based on a few examples that I had and opened to inspect, the "surge protection" is typically only applicable to the power outlets. The coax connector simply grounds out the outer braid of the coax. Excessive energy can still travel down the centre conductor of the coax, damaging equipment.
Given that most coax entering the home from outside (antenna, cable, satellite) is--or should be--grounded at or near the point of entry to the home, this level of protection is redundant and unnecessary.
True coaxial surge protection should capture or stop excessive energy along the centre conductor. There are several ways to accomplish this. Often an inert gas tube is used.
Bottom line: If the powerbar you intend to purchase cannot or does not specifically claim to stop coaxial centre conductor energy spikes, then it's probably not a true surge protector for coax.
Roof-top mounted Antennas Direct DB8e & C5, Channel Master 7777 preamp, Siemens surge protection. TiVo Roamio DVR