How to detect multiple digital sensor with one micro controller input?
I have used these before and your specs may not be what you want.
Received carrier is logic "0' and no carrier is Logic "1" which has an absolute max output voltage of 0 to 5V +/- 1 Schottky diode drop of 0.3V for ESD protection.

Since the output is NPN collector out with 33kohm pullup to Vs(+) in the "off" state, you want sensors with a weaker or no signal to be ignored , a logic AND function for any low input to give a low output (or NAND )  and but never a logical OR as a sensor with no signal will remain high.

The AND function is all wired in parallel which is bad practise for debug, so take note. I would suggest a  CMOS 4068 - 8 Input NAND gate.  

But since the max current for a "0" is 5mA if using 5V then each external pullup draws 5V/33k=0.15mA you can use up to 33 in parallel.

Input data patterns shown in spec Fig 1 must be adhered to match the AGC and BW filters for optimal reception for \$t_d,t_{pi}, t_{po} \text{ and } f_o\$