I am combing two antennas outside on my pole...My question is, what are the few choices of lowest loss combiners that will stand the elements of the weather???(snow, ice, etc.)...
Good luck with that... Combining dissimilar antennas aimed in different directions can most charitably be described as "potluck". You'll get what you get and that's what you'll get. Temper your expectations.
Any outdoor-rated two port splitter will suffice. Use quality compression fittings and it will be water-tight.