Wound 12 trifilar turns 22awg on an Amidon FT114-43. Hooked it up in autotransformer fashion so as to create a 36 turn primary and a 12 turn secondary. This was a 3:1 turns ratio which equates to a 9:1 impedance ratio. Secondary was connected across a SO-239 connector. The end fed antenna wire is a 45' length of 16awg MTW (machine tool wire), no special reason for the length, just had it available so used it. Did not bother with a counterpoise or ground, seemed to work fine without. As mentioned, performance is absolutely outstanding compared to just an ordinary wire antenna. For example, heard NDB 362 SB Sudbury ON 300mi from my QTH, a good catch for mid-afternoon. WLW 700 AM Cincinnati, also about 300mi away also mid-afternoon, sounded like a local with a S9+15 signal (have to use an active preselector to get the same result with just a regular wire antenna). Performance begins to drop off above the AM broadcast band but that is OK with me because my intent was to build an antenna specific for LW/MW.