Now that you mention it, id does look like a transom mount, mounted upside down.

We just installed an Airmar tilted element in my buddies Albemarle yesterday replacing one that sort of looked like jawz's example above. The wood fairing block was quite rotted but still took some persuasion to remove the old one. Once removed the stem was bend about 1/2" off center...probably a good idea it was being replaced. Now the fun begins snaking the wire up to the bridge.