I installed my own, for about $100. Works great, pride of accomplishment, yadda-yadda-yadda. But I live in a "can't miss" area.
You might well get a good antenna and rooftop install for $200-$300, assuming you don't need a rotor or anything fancy. It'll be done much faster than you could do it, and done better- these guys have meters and experience. And you'll have peace of mind and no broken bones- and someone else to complain to if all does not go well.
Yes, by and large I think getting a pro to do it is money well spent, probably less than you expected, and I second the idea. Doesn't hurt to call and estimates may be free.
And I never heard of a pro using a Terk.