I don't know who thought of "pitch pads." They've been around since the "Golden Age of Television," when antennas were the only option for getting a television signal.
I haven't used "pitch pads" for 20 years. Here's the reason why.
The roof shingles are held to the roof by 4 to 6 roofing nails. The bond of the roof to the deck and the deck (OSB or plywood) to the rafters is, again held by a few nails. With "pitch pads," you basically glue the tripod legs to the shingles. That means if the antenna blows off ot the roof, the assembly shears off at the weakest point. The shingles are ripped off of the roof with the tripod.
The tripod base surface needs NO sealing at the point of contact with the shingles. Driving a screw through the "pitch" pad means that a little of the sealant gets on the screw threads and a little satays unde the head and is basically sqeezed out as the head pulls down the metal mounting flange of the tripod base.
Put the sealant, where it is most needed.
Contrary to conventional wisdom, driving screws through asphalt shingles "without" sealant offers better sealing than with using "pitch pads."
I use a #14 sheet metal screw with a 3/8 inch hex washer head. This is what is usually supplied with tripod and antenna mounts.
The screw is hardened and is tough enough to be driven trough the shingles, the roof deck and into the rafters wihout predrilling.
The heat generated by the friction of the screw going in will "melt" the asphalt in the shingles, and the asphalt will cool to form a good seal around both the threads and the head.
If you want addional sealing, I drive each screw down and leave an inch or so sticking out. Then, with a cheap solder brush, I "paint" rooding cement under the head and the remaining inch of the threads. That would add additional sealing, where sealing is really needed and does the most good. To prevent rusting, I'd "paint" the neads with a dab of roofing cement.
Done this way, if the antenna is ripped off of the roof, the shingles stay on the roof with little damage.
Later, the removal of the antenna and tripod leaves a "virtually" clean roof and very small 1/4 inch holes to seal with roofing cement.
When sealed, the repair is "nearly invisible" from the ground.