[JRTJH]

The old antennas were based on analog TV broadcast standards. As such the antenna size (1/2 or 1/4 wavelength) either improved or degraded reception capability. The current TV broadcast standards are digital and significantly different from the old standards. The antennas used with digital broadcasting are much smaller and contain much more "signal enhancement gadgets and amplification" than the older style analog systems.

Just like tires, bearings, air conditioners and trucks, there are different "quality" products on the market. I don't have much experience on which brands are best and which brands should be avoided. I do know that with the very short elevation most of them have above the roof of the RV, placement is critical. Putting an antenna "in the shadow" of the air conditioner, for example, will essentially "kill all reception" from that direction.

Granted, there are some "electronic wizardry" to compensate for part of that shadowing, but placement still is probably the most important factor in good reception inside the RV.