Rescan antenna for channels

If I haven’t moved my antenna is it still necessary to rescan for reception? Having said that I notice that some channels I’ve received great reception for in the past are now having reception issues.

Primary reason to rescan is to find if there are any new stations. Where I am, the diginets x.2 and higher) seem to get shuffled around every few months.
If you’re having reception issues a rescan typically won’t help. The change in reception could be temporary. The station may have lowered power for maintenance or repair. It could be seasonal or weather related.

Thanks for the response. Kinda what I assumed but good to get confirmation.