I'm looking to understand the limits and best practices (if they exist!) for RF transmission in freshwater at one of the follow frequencies 433MHz, 915MHz or 2.4GHz and using a ZigBee, LoRa or Xbee like device. One transciever's antenna will be underwater no more than 1 meter depth (more likely 0.5 meter) and the other transciever's antenna located in air about 1 or 2 meters above the water. The total range is 50 to 200 meters. The units will always remain upright however they may move around so would a vertically oriented dipole antenna be a good choioce? Ideally we'll like to use a 1/4 wave antenna with ground plane for the underwater side. The air side can be a 1/2 wave dipole antenna. We ran a test using two 900MHz radios with 1/2 wave dipole antennas 2 meters off the ground. It worked over 500 meters outside in air with a couple houses and some trees in the way. Any thoughts on how the same radios and might do in the described setup at the 3 frequencies?