Since our 6 3/4" and 21" antenna products have been mentioned here, I will throw out there if you have any questions feel free to email or call with any you may have.
We stand behind our antenna products and if you're not happy with the option you went with we encourage to contact us to exchange to a different option or simply return for a refund. I personally use the 6 3/4" on my GM truck and this is the antenna most of our customers opt for as it is a very durable antenna. If you're one who uses touch car washes, its guaranteed not to break.
Zach
TheAntennaSource