Robin Leadbeater

Hi Eric,

If you were transmitting you might want to tune it more precisely to provide a better match to the transmitter but  a 3 element yagi antenna tuned for 144-148MHz  should work ok at 143MHz for receiving. (It would be difficult to retune in any case as you would need to increase the length of the elements slightly). For example there is an article on  the BAA  radio astronomy website showing a 7 element yagi centred on 143 MHz  with a flat response over +-7MHz bandwidth, fig 2.9 on page 8 here