I have the Tram (or Browning, or Tram-Browning, depending on where you look) - all the same company, version of the Larsen NMO-27 professional land mobile style 26-30 MHz antenna, currently cut for 27.4 or 27.5 MHz, somewhere around there) and with a decent NMO mag mount antenna it actually performs just as well as the higher end Wilson, Hustler, K40, etc offerings.
That Radio Shack antenna is a classic. I have the more modern version of it (that lacks the teardrop shape mount, the one I have has a regular old round mag mount but the antenna itself looks exactly the same). The SWR readings on it are surprisingly good.
27.385 LSB is active right now by the way.