I saw the ANT+ USB sticks while doing my search but I think they are designed to upload the information stored in the ANT+ storage device directly to a PC. If there is compatibility with Android OS and will work with the ANT+ sensors directly then that would be great but I didn't see that being mentioned in the product descriptions. Garmin has a version of a USB stick and there are aftermarket versions as well. No indication I could find that they make one designed to work with an Android ( directly with the ANT+ sensor ). At the moment other than the "Selfloop set-up" I mentioned I don't see any other options. Hopefully that will soon change.

The Selfloop set-up does look bulky but is no more bulky than if you already run the phone with an external battery. Now if there is an ANT+ USB stick available, being less bulky that would be preferable but then you probably wouldn't be able to hook up an external battery with the stick in the way. (?) That's probably why the selfloop included a battery. Personally I'd rather just have a stick as long as the app's that run all this stuff don't drain the battery down too fast. That would be the question to ask before buying anything.

The selfloop is clunky. I doubt it will succeed (the relay approach is cleaner).

There are two alternatives if your phone supports BT4.

Go read my 8/23/2013 4:59 post.

It's not clear why you want ANT anyway. You can get BT transmitters for speed/cadence and HR.

You might need to wait until BT (Bluetooth) is sorted out on android or get a iPhone.

Also note that Wahoo is gauging interest in a version of the RFLKT that includes an ANT+ bridge to allow ANT+ sensors to be monitored via BTLE/4.0 smart phones. See the kickstarter here: https://kck.st/1ap1j2C