The BEST option for a low profile , lightweight  2 antenna receiver has arrived!

RadioMaster - R84 4ch Frsky D8 Compatible PWM Receiver

Number of Channels: 4
Frequency range: 2400-2483.5Mhz
Power input range: 4.5-8.4V
Signal format: Frsky D8 Compatible
Output format: PWM
Control distance: more than 1km
Antenna length: 6cm
Size: 17x11mm
Weight: 2 grams