Wolf is not making the .64 wave currently.
Mr. Coily's antenna has a small following and people seem to be happy with it. It's tuned at the factory which may or may not work in your environment. I've yet to get one for testing and I believe the coil at the base is less than optimum.
There are HUNDREDS if not THOUSANDS of people out here who use and LOVE their I-10K! Many of the users on this forum use them and can swear to their performance.
The I-10K was an offshoot of a Mastadon 5000 built by Jay in the Mojave. The Mastadon 5000 was an upgraded copy of the Penetrator made by Hy-Gain. The Mastadon 5000, while able to handle more power than the Penetrator, still didn't perform as well as Jay wanted.
A complete re-design became the Interceptor 10K which remains to be the best built 5/8 omni to date! It is a FANTASTIC antenna in both electrical and mechanical performance.
I understand there is a current waiting list to get one (I'm on that list). I've own one currently and have had 3 others up at the house here. I've also installed more than 10 of them throughout Southern CA for other operators.
If you want the best and are not afraid of the $289.00 sticker price, then the I-10K is the antenna to have!!!
http://www.a1antennas.com/
Give Steve and call and find out when he plans to ship! (Then come back here and let the rest of us know!
BTW, A1 Antennas even has their own section right here on this forum!!!
http://forum.worldwidedx.com/viewforum.php?f=26
(How's that for cheerleading folks?! I wouldn't do it if it wasn't TRUE!)