The reason kung bakit ang horizontal coil ang ginagamit nila for the signal is mas mataas ang frequency cutoff ng horizontal coil (which translates to wider bandwidth). The vertical deflection coil is capable of displaying up to a few hundred Hz only. Kung gusto mong orient ang display sa 'tamang' ikot, madali lang- I am not talking of standing your TV on its side. Ikot mo lang ang deflection yoke
Nevertheless, you should be aware of the vertical (signal) limitation of this setup, hanggang audio frequencies lang ang kayang display nito. You can stretch the bandwidth a bit more by driving the coil with high voltage drivers.
Finally, make sure yung brigthness ng TV is nakaset sa tamang brightness lang to prevent burning your CRT face.