I use Futaba. What I have done is mounted my receiver behind the wing tube.(large scale)
Anyway I use a small piece of coffee steerer glued to the wood and insert one antenna in the steerer after the glue has dried. This holds the antenna in place. Then I drilled a hole through the wood and glued a second piece of steerer through the hole, inserted the antenna.
Bottom line I have one antenna parallel to the deck the other is pointed straight down 90deg