Quickly becoming one of my favorite elk calls is the "Who's Yrr Daddy" (WYD) open reed elk call from Rocky Mountain Hunting Calls and Supplies. I recently have been practicing a ton with diaphragm calls made by them, but I still love using the open reed calls due to the ease of use and realistic sound.
Using a diaphragm call is great and you can do so much with them, but I like the ease of the open reed call as well. I really have no preference of one over the other. I have used other open reed calls in the past and had good success, but I have not used one with as much sound adjustment and clarity as the WYD. As I keep practicing with the diaphragm calls they will most likely be my go to calls this fall during archery elk, but I will always pack my open reed calls. I don't think you can ever take too many calls hunting as you never know what sound they are wanting to hear.
They WYD call is great because of its small size and various sounds you can make. There is a button on top which allows you do more of an estrus call as well as a rubber sound dampener on the end. To use the call you simply use your top and bottom lip starting towards the close end to your mouth on the reed, slide your lips down, and release a little pressure to give the low note. Without using the button you can make great calf sounds as well as a great cow sound. If you use the button you can sound like an older cow and your estrus sounds. Also as the elk get closer you can squeeze the rubber end and make your calls softer and quieter. It is a great cow call with lots of features that most open reed calls don't account for. The only capability that this calls doesn't have is the ability to bugle.
If you are having trouble getting used to a diaphragm call and you want the versatility of a cow call that can do it all, the WYD is the one to look at. There is also a WYD "Signature Series" call that comes in wood barrel and is signed by Rockie Jacobsen. This along with several other calls offered by Rocky Mountain Hunting Calls will be with me this upcoming fall. Like I said before you never know what sound they will want to hear so having a variety is your best bet.
To pick up these calls go to www.buglingbull.com or look at your nearest dealer. To find a dealer close to you, that information is on the site as well.