How to get return loss below -10dB for monopole antenna which has very less or no ground plane (or directly interfaced with sma connector) ?

I am designing a monopole antenna For 59MHz frequency . The lamda length is 5m. I tried for lamda/2 which is directly interfaced to sma connector. Couldn't get proper return loss.( According to...

12 March 2020 5,008 2 View