Hi,
Not easy way the multiple 1/2 lambda cut cables. If cable long, the loss is big problem on high frequency. The 1/2 lambda works good only one fixed frequency and short, precisely cutted 1/2 lambda cables on SWR meter. OSLT calibration may help. My method with wifi capable instrument, short coax cable 1/2 lamda on 145 mhz and 3 * 1/2 lambda on 435 mhz + cable end osl calibration. Zero lengh coax bad idea, the instrument part of the antenne.
73,
Lajos