Pues no se si habreis visto este modelo creo que del mismo fabricante y mas "vintage": articulo de eBay 370086502951
A mi me parece "chulisima", no tan moderna de aspecto pero creo que las prestaciones son practicamente iguales aunque es algo superior en precio.

TG39 indoor mediumwave loop antenna. This TG39 antenna has the very good performance to improve the signal reception on the broadcasting mediumwave band (please refer to the picture in this list page about the comparison when the TG39 antenna is on and off). The power supply is not needed, and it is very easy to setup and play this TG39 antenna.
This TG39 antenna was designed and manufactured by a Chinese radio manufacturer located in Shenzhen, Southern China.
Item Description
Working frequency coverage on mediumwave broadcasting band: 530KHz to 1710KHz.
No battery or external power supply required.
Dedicated tuning knob for the frequency tuning.
No connection cable needed when working with the radio which has the inside ferrite mediumwave antenna.
Built-in output socket to output the signal directly for using with the radio which has the external mediumwave antenna input socket (we don't provide the connection cable, customer need to DIY it by self).
The dimension of the loop (side length) is 280 x 280 mm / 11 x 11 inch.
Easy to setup and use with the radios which has the inside ferrite mediumwave antenna or has the external mediumwave antenna input socket (we don't provide the connection cable, customer need to DIY it by self).
Excellent performance to improve the signal reception on the mediumwave broadcasting band, please refer to the following picture about the comparison when the TG39 antenna is on and off.