I bought an open box unit on Amazon for $30 shipped and figured it was worth experimenting with. So far so good, but we will see how it holds up with daily use this summer. The Legacy LN46 units that used to be recommended in the DeLorean community were trash and I went through 2 of them in the course of five years.
I do notice that this Metra antenna operates much more slowly (in terms of speed to extend and retract) than the Legacy LN46 did, but it is also much quieter.