Bob wrote:
"What would be the best ratio between horiz. and vert. legs?"

Short answer: Zero. All the wire should be vertical for best results.

Try to borrow a copy of ON4UN`s "Low-Band DXing" published by ARRL. Look
at page 9-48 for the radiation resistance (good) for an inverted-L with
various ratios of horizontal and vertical portions. Mistly, this is a
vertical antenna with the forizontal section providing top-loading.

Best regards, Richard Harrison, KB5WZI