Even with equipment built in 1960s (VC9 & 707s), we used the WX radar for take off. It was set with the tilt angle to +5 degs (so no close ground return) and so we could avoid any CBs on the initial climb out.
We could apparently damage the receivers if it was switched on whilst facing a hangar door or large building - but even those sets were designed to be used on take off.
Is any body still using stuff designed in the 50s?