Designing a low-cost, low-performance UHF RFID antenna 902 - 928 MHz
The following is worth a try and won't cost much.

Grab a length of cheap speaker wire - the "zip" kind of wire that consists of two parallel conductors that can be easily split into individual wires.  Make it as long as the bench.

Solder a 50 Ohm surface-mount resistor at one end of the wire across the two conductors.  You can use a through-hole resistor but the surface-mount resistor is neater.  Either 0603 or 0805 would work well.

Now simply connect the free end of the cable to the antenna connector on the receiver.

Performance is going to be lousy but may be good enough for your needs.