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Well I have had a gpk for the imax for a year just never put it up as to close to metal roof, so now I am adding another 10' section of tower to bring up to 40' + 8' mast and will install the gpk. I do not have any TVI in my own home or my neighbor's,  even when I fire up the sweet 16. I just have the tower grounded at base and no choke at base of antenna and near flat match on ch 1-40  so seems to work good as is, but will try the gpk and see if it improve floor noise or anything...gpk radials are at 75 degrees hope to have up as soon as we have some nice and not windy weather.