Surge Supressor

Anyone using something similar to this? What do you think? It says up to 1GHz.

http://www.amazon.com/TII-Broadband-Cable-Lightning-Protector/dp/B0016AIYU6/ref=cm_cr_pr_product_top?ie=UTF8

I would buy it and test it but I don’t have a spectrum analyzer to see the full function.

Thanks!

looks like it should be ok