Just some observations from a dew heater user.
The Kendrick and Dew-Not heater straps that I use, both have a continuous Velcro surface on the outside of the strip, so that you can wrap the heater strip around OTA’s of several sizes and still fasten the hooks to the loops.
Some heater straps only have a small length of hook & loop strip at the very end of the strip, making it impossible to fit e.g. a 5 inch strip on a 4 inch OTA, as the overlap is too big and the hook overshoots the loop.
My newish Dew-Not strips have a smaller diameter cable than my (old) Kendrick strips, although both are excellent in that they drape very well. Some cables on other products are too stiff and so stick out, having the potential to foul things.
Cheers
Dennis
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