Sorry, no. A shorted 1/2 wave stub at your frequency connected to a tee would be a dead short at your frequency. A 1/4 wave shorted stub at your frequency may work very well.
Al, K9SI A better option in your situation might be a shorted 1/2-wave stub at your receive frequency. Using good coax, fed on a tee connector, it should be nearly invisible at 900 MHz, but down 30 dB or more at 450 MHz or below. <snip>
